Showing posts with label physics. Show all posts
Showing posts with label physics. Show all posts

Tuesday, January 24, 2023

The Woman Who Split The Atom: The Life of Lise Meitner by Marissa Moss

When Lise Meitner was a young girl she loved math, often sleeping with a math book underneath her pillow. Her father who was from Czechoslovakia, and her mother who was from Russia, valued education for all of their eight children, including Lise. They lived in Austria where it was easier for Jews to study, work and live. However, higher education was off limits for girls in the late nineteenth century in Europe. Their presence in university was deemed distracting. In 1897, the laws were changed allowing women to enter university provided they passed the high school exit exam. This would be difficult for most young women at this time because they would not have attended high school. 

Lise and her older sister Gisela studied and passed the exam; Gisela went on to medical school while Lise went on to study physics at the University of Vienna in 1901. Most of Lise's classes where taught by Ludwig Boltzmann whose daughter was also studying physics. It was Boltzmann who believed in the existence of atoms (something controversial at the time), who presented to Lise the idea that physics was about seeking out the truth, and he urged her to go to graduate school.

Lise Meitner became the first woman to earn a Ph.D. in physics from the University of Vienna. Because no one wanted to work with a woman, she built her own lab equipment and began studying the absorption of alpha and beta radiation in different metals. In 1907, at the age of twenty-eight, Lise published her first article on measuring the scattering of alpha particles. After meeting Max Planck, who was studying quantum physics, Lise decided to move to Berlin. The University of Berlin was intimidating to Lise because it had no women students or professors. There, in 1907, she met Dr. Otto Hahn who was working at the Chemistry Institute. She was given a lab room in the basement but it had no equipment so Lise made her own equipment. Lise and Otto Hahn began working together and eventually both were given a new modern lab when the Kaiser Wilhelm Institute (KWI) opened. 

Lise met Albert Einstein in 1909 when they both lectured at a conference in Austria. Einstein's lectures were on relativity and how mass is a form of energy as defined by the equation E=mc2. Einstein explained later that the inside of an atom held enormous energy. He, like Lise and others believed this energy inside the nucleus of an atom could not be extracted or harnessed. In 1913, Einstein came to work at KWI and Lise was now teaching at the University of Berlin.

During World War I under the direction of Fritz Haher, Otto Hahn helped develop chemical weapons for Germany, gassing Allied troops with chlorine gas and killing thousands of men and maiming many more. Haber "weaponized chlorine" and also developed a means for Germany to make fertilizer and fertilizer-based explosives as well. For Lise, the use of science in warfare was deeply upsetting.

The post-war period in Germany was one of soaring inflation and tough times. Lise continued her research into beta and gamma radiation, studying the "decay chain of radioactive substances". She continued to publish scientific papers with Otto Hahn. Together they showed that decay could be used to date the Earth and Sun. It was an exciting time in radioactive research: the cyclotron was being developed to study particle behaviour, and Lise was using a cloud chamber to map the movement of particles.

In 1920, Lise became a professor at the University of Berlin. At this time she began a close friendship with Niels Bohr and his wife Margrethe after he came to lecture in Berlin and she in Copenhagen. In 1924 Lise won the Prussian Academy of Science's Silver Liebniz Medal. In 1925 she won the Vienna Academy of Science's Ignaz Lieben Prize and in 1929 she and Otto Hahn were nominated for the Nobel Prize in Chemistry. However, the 1920's saw the rise of anti-Semitism in Germany, especially against Jewish scientists like Einstein. There was a belief that there was a pure Aryan science and that the science of Jewish scientists was fraudulent.

January,1933 saw Hitler become the Chancellor of the Third Reich. It became illegal for Jews to work in government, universities and research institutions, so Einstein resigned from the KWI and the Berlin Academy of Sciences and remained in the United States. Many Jewish German scientists quit, leaving the country for Britain and the United States, but Lise Meitner was not one of them. Although she couldn't teach or attend meetings, she still had her lab. 

By 1938, Lise was the only remaining Jewish scientist at KWI and she was finally asked to leave by Otto Hahn who was being threatened with the loss of government funding. Lise lost her KWI apartment and eventually found herself trapped in Germany. With the help of an entire network of scientists, Lise fled Germany, through the efforts of Dutch physicists Dirk Coster and Adriaan Fokker and her editor Paul Rosbaud, to the Netherlands. She eventually moved to Stockholm, Sweden.

In  the mid-1930's,  scientists were bombarding elements with neutrons and creating what were thought to be new heavier isotopes which they called transuranics. After not having collaborated with Lise for many years, Otto Hahn and his new partner Fritz Straussman sought her out to help them understand their results. In 1938, when Lise met Otto in Copenhagen, they discussed the strange results of his recent experiments. Instead of seeing new heavier transuranics, Otto was creating lighter elements. He simply did not understand what was happening on an atomic level and he needed Lise's help. In 1939, he wrote up and published a paper with his results, concluding that all transuranics research needed to be reinterpreted. But Lise, contemplating his results, soon understood that something much more important was happening - the uranium atom was being split! It was this discovery that would change the war and the course of history. Unfortunately Lise Meitner would not be acknowledged for her discovery.

Discussion

Anyone who has studied chemistry and physics in high school and university will be familiar with the names and contributions of Albert Einstein, Niels Bohr, Max Planck, Werner Heisenberg, James Franck, Fritz Haber and Otto Hahn. What is almost certain, is that these same students have never heard of Lise Meitner, a woman physicist and a Austrian Jew who discovered nuclear fission.  The Woman Who Split the Atom tells Lise's story, her contributions to nuclear physics, her daring escape from Germany and her struggle to be recognized for her scientific contributions.

Marissa Moss has written an engaging, informative account of Lise Meitner's life and scientific contributions to nuclear physics. It is the story of a life set against the backdrop of gender and racial discrimination amid two World Wars.

Author Marissa Moss captures the determination and courage that Lise Meitner exhibited throughout her life, succeeding in spite of enormous obstacles encountered as a result of discrimination. Initially she faced many barriers simply because she was female. Women were finally allowed to attend university in 1907 but they had to pass a high school exit exam, despite the fact that girls could not attend high school  Lise passed this exam. Once she graduated, Lise couldn't get hired as a physicist and lost a good job writing for an encyclopedia because she was a woman. So she had to use her initial rather than her full first name to disguise her gender. 

Even though women were finally allowed onto the campus of the University of Belin in 1908, Lise found the atmosphere intimidating and hostile at the mostly male school. She was given a lab, in a basement without pay or position, and had to make her own lab equipment. Despite all of these obstacles, Lise's hard work and determination eventually saw her develop an international reputation for her research on radioactivity. She published many articles and earned the respect of many of her male scientist-peers. 

When she finally achieved an academic position in Berlin, a new obstacle surfaced: her Jewish ancestry. But Meitner was reluctant to flee to safety until the last minute, because it meant giving up all that she had achieved as a woman physicist. It would mean starting all over. Because she had overcome many of the barriers due to her sex, she felt she could also overcome the barriers due to being Jewish. She could not have been more wrong.

However, an even greater challenge awaited Meitner. In 1938, Lise Meitner was able to explain Otto Hahn's unusual experimental results as the splitting of the atom, a process she called nuclear fission.  Lise and Otto Hahn published a paper in 1939 describing nuclear fission and were nominated for the Nobel Prize in 1941, 1942 and 1943. In 1945, Otto Hahn was awarded the 1944 Nobel Prize  for nuclear fission. He refused to acknowledge that it was Meitner who understood the atomic process that was occurring in his experiments. This lack of credit continues to this day, with the continued erasure of Lise Meitner as the scientist who explained the process of nuclear fission.

In her Author's Note, Moss writes, "By focusing on Meitner's work, as she did herself, I found the story that needed to be told: how a brilliant woman was marginalized first because of her gender, then because of her ethnicity, and ultimately by her gender again when the Nobel Prize went to a man who had no concept at all of nuclear fission, rather than to the woman who had described exactly what happened." Moss's book is an attempt to give Meitner back her place in history as the discoverer of nuclear fission. 

Her erasure was foreshadowed by the events surrounding the discovery of a new isotope called protactinium in which "...Meitner did the experiments, discussed the results with Hahn, wrote up their findings, and published them." Hahn received credit for this discovery and was awarded the Emil Fischer Medal. Meitner received a copy of the medal and no recognition for her research. She would be nominated at total of FORTY-EIGHT times for the Nobel Prize. She never won.

There are forty short chapters in The Woman Who Split the Atom, each beginning with an comic illustration of an event to be highlighted in the chapter. Moss describes Lise Meitner's struggles to be accepted into the male-dominated world of science, and to have her work acknowledged, something that was denied repeatedly. Moss also describes Lise Meitner's belief that science should be used for the good of mankind. This belief was severely challenged through two world wars that saw scientists develop chemical warfare in World War I and the atom bomb in World War II. In the latter war, it was Lise's discovery of nuclear fission the led to the development of the bomb. She would work towards developing atomic energy and to challenging German scientists who refused to acknowledge their complicity in the Holocaust.

The Woman Who Split the Atom is fascinating reading, drawing on the considerable research done by Marissa Moss. It is highly recommended for those interested in history and science, especially the discovery of atomic energy. Moss includes a detailed Afterword which is a sort of Epilogue demonstrating that the record regarding the discovery of nuclear fission remains incomplete and inaccurate without the acknowledgement of Lise Meitner's contribution. This thorough and detailed biography includes an Author's Note, a Timeline of Meitner's Life and Achievements, Glossary of Select Terms in Physics, Profiles of Scientists Mentioned, Notes with sources of quotes, a Select Bibliography and an Index. 

Book Details:

The Woman Who Split The Atom: The Life of Lise Meitner by Marissa Moss
New York: Abrams Books for Young Readers     2022
258 pp.

Sunday, May 16, 2021

Queen of Physics: How Wu Chien Shiung Helped Unlock the Secrets of the Atom by Teresa Robeson

In the town of Liuhe, China, the Wu family celebrated the birth of a baby girl. Unlike many people at this time, the Wu's did not hold the common view that girls were not as smart as boys and therefore should not attend school. Instead they believed their daughter would be both smart and brave and so they named her Chien Shiung which means "courageous hero".

Before Chien Shiung's birth her parents were already actively involved in the education of girls. Her father had left his engineering job to open a school for girls and her mother encouraged families in their village to send their daughters to school.

At the school in Liuhe, where her father was the principal and her mother a teacher, Chien Shiung quickly learned how to read, write and do mathematics. Her parents decided to send her to a girls school in the city of Suzhou, fifty miles away. This meant that Chien Shiung would have to live away from home, except for summer and winter vacations.

In Suzhou, Chien Shiung enrolled in the teacher training program but she also taught herself from the academic program which covered the sciences.By day she studied her own program, at night she did what she called "self-learning" from the academic textbooks borrowed from friends.

Because of her hard work, Chien Shiung was seen as a leader and eventually came to lead a student underground group that was fighting against the government. 

When she was seventeen-years-old, Chien Shiung graduated with top honours and continued her studies in Nanjing at the National Central University to study physics. At university, she continued to be an influential student leader attempting to get General Chiang Kai Shek resist the invasion of China by the Japanese prior to World War II.

In 1936, Chien Shiung left China and travelled to Berkeley, California to continue her study of physics. She was particularly interested in the study of atoms and beta decay. From this point on, her studies on the atom would lead to Chien Shiung understanding beta decay better than almost anyone in the world. As she solved problem after problem, Chien Shiung unfortunately received little recognition, never winning a Nobel Prize for some of her most valuable research. However, she came to be known as the Queen of Physics.

Discussion

Most adult readers will probably never have heard of Wu Chien Shiung and therefore know little about her incredible contributions to the field of atomic physics. But Queen of Physics will give readers of all ages, the important details of Chien Shiung's life and her research in the interesting format of a picture book. 

Chien Shiung Wu was born on May 31, 1912 to Wu Zhong-Yi and Fan Fu-Hua. She had an older brother Chien-Ying and a younger brother Chein-Hau. In Queen of Physics, Robeson emphasizes the role Chien Shiung's parents played in her development as a scientist. It was their belief that girls could accomplish as much as boys and that girls should be allowed an education. Although Robeson doesn't go into much detail in this children's picture book, in the autobiography, Madame Wu Chien-shiung: The First Lady of Physics Research by Tsai-chien Tiang, Chien-Shiung's father was a major force in her youth. Wu Zong-Yi was a progressive and knowledgeable man who was very close to his only daughter. He was well read and exposed to the Western ideas of democracy and freedom, but he also valued Chinese culture and traditions. He wanted his children to be prepared for the changes that he felt were coming. He recognized the Chien Shiung was gifted and set about to help her cultivate those gifts. This close relationship and mentorship between father and daughter is a feature many famous and accomplished women scientists share.

Chien Shiung also worked hard to achieve the success her parents believed she was capable of but this success came at the price of never again seeing her parents when she left for the United States in 1936. World War II and the Communist revolution prevented her from returning while her parents were still alive.

Queen of Physics also highlights the difficulties women scientists have had in achieving recognition of their outstanding achievements. Robeson describes how Chien Shiung made at least three significant contributions to particle physics, each important to the work of other scientists. Despite this, her contributions all of which were major discoveries, were not recognized along with those whose research she helped, when the Nobel Prizes were awarded. In this regard, Chien Shiung was in good company with the likes of Rosalind Franklin, Lise Meitner, Vera Rubin and many other stellar women scientists whose contributions went unrecognized for decades.

Robeson interesting biography is accompanied by the artwork of Rebecca Huang which incorporates features of Chinese culture and mathematics and physics notations. Included is a Glossary of terms used in the biography, a short note on Wu Chien Shiung's life, a Bibliography and suggestions for further reading.

Book Details:

Queen of Physics: How Wu Chien Shiung Helped Unlock the Secrets of the Atom by Teresa Robeson
New York: Sterling Children's Books    2019

Saturday, November 24, 2012

Albert Einstein and Relativity for Kids by Jerome Pohlen

"Imagination is more important than knowledge. Knowledge is limited. Imagination encircles the world."
                                                                                         
Everyone knows Albert Einstein developed the theory of relativity but how much do we really know about this famous scientist and his theories? Adults and children alike will be fascinated with the details they learn about Einstein's life and his theories in Jerome Pohlen's book on Einstein. Pohlen tells Einstein's life story in a straightforward manner while also presenting simple experiments that explain some of the points of relatively and physics.

Einstein was born in Ulm, Germany in 1879 to nonobservant Jewish parents, Hermann and Pauline Einstein. His family moved to Munich where Albert lived until he was 15. When their electrical business failed, Hermann moved the family to Milan, Italy without Albert. Albert was not pleased about this and soon found a way to join them. He managed to gain entry into the Swiss Cantonal School of Aarau in Aarau, Switzerland in 1895. At this time of his life, Einstein wanted to renounce his German citizenship and after a period of time he managed to get his father to agree to his request. His citizenship was revoked in January, 1896.

In the fall of 1896, Albert began classes at the Zurich Polytechnic Institute, studying to be a physics teacher. However, Einstein was not a serious student. It was at this time that he met Mileva Maric, one of five students studying physics. Interestingly, Switzerland was the only German-speaking country where Mileva could apply to undertake post-high school studies.

Mileva and Albert gradually became romantically involved. She was the perfect companion for him at this age; intelligent and stimulating. When he graduated, Einstein was unable to find a job and in 1901 Mileva became pregnant and gave birth to a baby girl.  It is not known what happened to this child named Leserl.

Albert and his first wife, Mileva
In 1903 Mileva and Albert married and a year later they had their second child, Hans Albert. It is amazing to see the strong resemblance Hans Albert had to his father when he was younger. You can see this for yourself by viewing the picture of Albert Einstein and his younger sister, Maja, on page 4 and that of Eduardo and Hans Albert taken in 1914 on page 60.

1905 is considered Einstein's "Miracle Year" or "Annus Mirabilus" when he published five groundbreaking papers on time, space and matter that forever changed the way we look at the universe. At this time, the Einsteins were living in Bern, Switzerland, and Albert, chronically underemployed, was working at the Patent Office as a Technical Expert, Third Class. This was a perfect situation for Einstein as he had a group of mathematicians and physicist with which he could discuss problems in theoretical physics. And it provided the right environment for him to formulate some of his key ideas into his most famous theory.

Discussion

In Albert Einstein and Relativity for Kids, Pohlen takes readers through a brief explanation of the innovative concepts in each of Einstein's five papers using examples and simple experiments. An entire chapter explains the basic concepts behind Einstein's Special Theory of Relativity while another chapter explores the ideas of Einstein's General Theory of Relativity.

After Einstein's ideas were published and he began to gain widespread acclaim, some began to question his theories. claiming his work was Jewish physics and others that his work was immoral because it suggested everything in the universe was relative, included morality. Amazingly, Einstein never won the Nobel Prize for relativity. Instead he won the 1921 Nobel Prize for his work on the photoelectric effect - an area of research his major detractor, German physicist, Philipp Lenard specialized in!

This book also delves into Einstein's personal life which involved him abandoning his first family for another woman, his estrangement from his oldest son, and his fleeing Germany at the outbreak of the Second World War. It also touches on Einstein and the development of the atomic bomb and his pacifist views on war, as well as his latter years. Einstein was not directly involved in the Manhattan Project, which resulted in the first a-bomb, but many of his contemporaries were.

Albert Einstein and Relativity for Kids
is marketed as a book for children in Grades 4 to 6 but this book is probably too advanced for that age group and contains too much detail for the younger end of that group. Instead it is better used for older children aged 12+ who have a keen interest in relativity and for those studying the early 20th century. Pohlen's style is readable and engaging. This is a beautiful book, with glossy pages, lots of photographs of Einstein and the major characters in his life story as well as famous scientists of this time period. The front of the book contains a timeline of important dates while the back of the book has a list of books for further study and websites and places to visit.

Image credits: 
Einstein and his wife: https://www.teslasociety.com/Mileva.htm

Book Details:

Albert Einstein and Relativity for Kids by Jerome Pohlen
Chicago: Chicago Review Press   2012
126 pp.