Statement - 1: When ultraviolet light is incident on a photocell, its… | JEE Main 2010 (AIEEE)

Q71JEE Main 2010 · AIEEEMedium

Photoelectric Experiment: Intensity, Stopping Potential & Graphs

Statement - $1$ : When ultraviolet light is incident on a photocell, its stopping potential is $V_0$ and the maximum kinetic energy of the photoelectrons is $K_\mathrm{max}$ . When the ultraviolet light is replaced by $X$ -rays, both $V_0$ and $K_\mathrm{max}$ 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.

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Answer: (b)

X-rays have higher frequency than UV, so $K_{max} = h\nu - \phi$ and $V_0$ both increase. Statement 1 is true.
The spread of speeds from zero to maximum occurs even for monochromatic light, because electrons lose different amounts of energy coming from different depths and bound states. Statement 2 is false.
So the answer is (d).

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