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  4. Photoelectric effect shows:

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Q. Photoelectric effect shows:

AFMCAFMC 2003

Solution:

In $1905$, Einstein explained the phenomenon of photoelectric effect on the basis of Planck's quantum theory. According to this theory light travels in the form of small bundles or packets of energy called photons. The energy of each photon is hv where v is the frequency of light and h is Planck's constant. The intensity of light depends on the number of these photons. Hence, photoelectric effect shows particle nature of light.