A) discovery of X-ray by Roentgen
B) Mullikans oil drop experiment
C) Braggs work on X-ray diffraction
D) Mosleys work on X-ray spectra
Correct Answer: D
Solution :
[a] Discovery of X-ray by Roentgen helped in finding radiations from atom. [b] Mullikans oil drop experiment determines the charge on electron. [c] Braggs work on X-ray diffraction helped in determining structure of solids. [d] Moslems work on X-ray spectra proved significance1 of atomic number.
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