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1924
k.m.g. Siegbahn (Swedish)
Spectral lines found in x-rays
1925
James Frank, G. Hertz (German)
Discover the laws of collision between atoms and electrons
1926
j.b. Perran (French)
Study material discontinuities and find sedimentary balance
1927
Arthur Holly Compton (American)
Discover the Compton effect (also known as Compton scattering)
c.t.r. Wilson (British)
Invented the cloud room, which c ...
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