11. Dual nature of radiation and matter — Physics STD 12 Science — Question
CBSE BoardEnglish MediumSTD 12 SciencePhysics11. Dual nature of radiation and matter1 Mark
MCQ
Photoelectric effect was successfully explained first by
A
Planck
B
Hallwash
C
Hertz
✓
Einstein
✓
Answer
Correct option: D.
Einstein
d (d) Einstein successfully explained the photoelectric effect using the assumption $E= hv.$ This assumption is given by Planck. Einstein showed that not only light is quantized but also atomic vibrations are quantized. He was able to explain this result by assuming that the oscillations of atoms are quantized according to $E=$ $n h \nu$
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