100 Scientists Who Made History

Page 92

t r e b o r e R m i J enhe ted the p a e r c p physicist who BOMB O The ATOMIC

This brilliant American scientist made many important contributions, but he is known for developing the devastating nuclear bombs that ended World War II.

ve element The radioactid as fuel in use uranium was bombs in 1945. the atomic

Race for atomic weapons Born in 1904, Oppenheimer went to Harvard University, USA, where he became immersed in the world of atoms and how they interact with each other. During World War II, the Allies feared that Nazi Germany would build an ATOMIC BOMB, so in 1942, Oppenheimer was appointed the director of the Manhattan Project, the Allied effort to develop atomic weapons first.

The Trinity test Oppenheimer established the Los Alamos National Laboratory in New Mexico and recruited a team of leading scientists. In July 1945, a plutonium bomb was successfully detonated at a remote test site in nearby Alamogordo. Code-named Trinity, this test created a crater over 300 m (980 ft) wide and ushered in now? k u o Did yenheimer was bel the ATOMIC AGE.

Replicas of the two atomic bombs, Little Boy (left) and Fat Man

omb An atomic b to a in s explode loud. mushroom c

Opp for the No ree ted nomina in Physics th and , Prize 1945, 1951 . n in times, but never wo 1967,

Who came before...

92

In the 1930s, Austrian physicist Lise Meitner and German chemist OttO HaHn discovered nuclear fission – nuclear technology relies on this process – when they split a uranium nucleus by bombarding it with neutrons.

Italian physicist enricO FerMi developed the first nuclear chain reaction in 1942. This is the process in which a neutron splits a uranium atom, producing more neutrons that split further uranium atoms.


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Acknowledgments

13min
page 128

Index

4min
page 127

Let’s applaud

3min
pages 124-125

Glossary

2min
page 126

Communicators

1min
pages 122-123

Rachel Carson

1min
page 121

Ali Javan

0
page 120

Alfred Nobel

2min
pages 118-119

Alan Turing

2min
pages 116-117

Joseph Lister

2min
pages 114-115

Wilhelm Röntgen

0
page 110

C V Raman

0
page 111

Computing creatives Ada Lovelace

1min
pages 108-109

Nikola Tesla

2min
pages 112-113

Rudolf Diesel

1min
page 107

James Watt

0
page 106

Stephen Hawking

2min
pages 102-105

Vera Rubin

2min
pages 100-101

Edwin Hubble

2min
pages 98-99

Quantum physicists James Chadwick

2min
pages 96-97

Penzias and Wilson

2min
pages 94-95

Albert Einstein

2min
pages 90-91

J Robert Oppenheimer

2min
pages 92-93

Ernest Rutherford

2min
pages 88-89

James Clerk Maxwell

2min
pages 86-87

Isaac Newton

2min
pages 84-85

Edmond Halley

1min
page 82

Henrietta Swan Leavitt

1min
page 83

Nicolaus Copernicus

0
page 77

Christiaan Huygens

0
page 81

Galileo Galilei

2min
pages 78-79

Johannes Kepler

0
page 80

Leonardo da Vinci

0
page 76

Barbara McClintock

2min
pages 72-75

Alice Ball

2min
pages 68-69

Dorothy Crowfoot Hodgkin

2min
pages 70-71

The Curies

2min
pages 66-67

Inventive chemists

1min
pages 64-65

Dmitri Mendeleev

2min
pages 62-63

Louis Pasteur

2min
pages 60-61

Michael Faraday

2min
pages 58-59

Alessandro Volta

2min
pages 56-57

Joseph Priestley

0
page 55

Joseph Black

1min
page 54

Robert Boyle

2min
pages 52-53

Medical masterminds

2min
pages 48-51

Charles David Keeling

0
page 47

Inge Lehmann

2min
pages 44-45

James Lovelock

0
page 46

Franklin, Crick and Watson

2min
pages 42-43

Alexander Fleming

2min
pages 40-41

Thomas Hunt Morgan

1min
page 39

Nettie Stevens

0
page 38

Gregor Mendel

2min
pages 36-37

Seeing things Alhazen

2min
pages 30-31

Charles Darwin

2min
pages 34-35

Robert Hooke

0
page 32

Mary Anning

0
page 29

Fibonacci

2min
pages 22-23

Hildegard of Bingen

0
page 28

Averroës

0
page 21

Zhang Heng

0
page 16

Avicenna

0
page 20

Hippocrates

2min
pages 14-15

Al-Khwˉarizmˉı

2min
pages 18-19

Aristotle

2min
pages 8-9

Claudius Galen

0
page 17

Greek greats Pythagoras Empedocles Democritus

1min
pages 10-11

Archimedes

2min
pages 12-13
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