The wave nature of electron was first experimentally verified by:
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → Davisson and Germer
Why the other options are incorrect
Option (2) de Broglie — Incorrect. de Broglie proposed the wave nature of matter (1924); he did not verify it by experiment.
Option (3) Einstein — Incorrect. Einstein explained the photoelectric effect with photons, the particle nature of light.
Option (4) Millikan — Incorrect. Millikan measured the charge of the electron with his oil-drop experiment.
NCERT (2026-27):
De Broglie’s Explanation of Bohr’s Second Postulate of Quantisation – “… We studied, in Chapter 11, about the de Broglie’s hypothesis that material particles, such as electrons, also have a wave nature. C. J. Davisson and L. H. Germer later experimentally verified the wave nature of electrons in 1927.”