Statement-1 : When ultraviolet light is incident on a photocell, its stopping potential is

Question:

Statement-1 : When ultraviolet light is incident on a photocell, its stopping potential is $\mathrm{V}_{0}$ and the maximum kinetic energy of the photoelectrons is $\mathrm{K}_{\max }$. When the ultraviolet light is replaced by $\mathrm{X}$-rays, both $\mathrm{V}_{0}$ and $\mathrm{K}_{\max }$ increase.

Statement-2 : Photoelectrons are emitted with speeds ranging from zero to a maximum value because of the range of frequencies present in the incident light.

  1. Statement $-1$ is true, Statement $-2$ is false

  2. Statement-1 is true, Statement-2 is true; Statement-2 is the correct explanation of Statement-1

  3. Statement-1 is true, Statement $-2$ is true; Statement-2 is not the correct explanation of Statement-1

  4. Statement-1 is false, Statement-2 is true


Correct Option: 1

Solution:

Speed of emitted electrons is independent of frequency of incident light, because for same frequency emitted electrons have energy from 0 to $\mathrm{KE}_{\max }$.

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