Q. What is
photoelectric effect?
Ans. When a beam of visible or ultraviolet light falls on a
clean metal surface in vacuum, the surface emits electrons. This effect is
known as photoelectric effect.
Q. Define
Compton effect.
Ans. When light of a short wavelength strikes on an
electron, it is scattered and its frequency is shifted towards lower value.
This shift of frequency is independent of the frequency of incident radiation.
This behaviour is called the Compton effect.
Q. What is
de-Broglie hypothesis?
Ans. Louis de-Broglie
suggested that every material particle is associated with a wave. He argued that if light can sometimes
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