JEE Main · 2024 · 04 Apr 2024 · Shift 1 · Modern Physics

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Which figure shows the correct variation of applied potential difference (V) with photoelectric current (I) at two different intensities of light (

I_{1} < I_{2}

) of same wavelengths :

(A)(see structure)
(B)(see structure)
(C)(see structure)
✓ Correct
(D)(see structure)

Answer: (C)

Solution

Stopping potential depends only on frequency (wavelength), not intensity. Both beams have the same wavelength

\Rightarrow

same stopping potential

- V_{0}

(same

x

-intercept).

Saturation current is proportional to intensity, so with

I_{2} > I_{1}

the

I_{2}

curve saturates at a higher current. The correct graph has a common

- V_{0}

and the

I_{2}

plateau above the

I_{1}

plateau

\Rightarrow

option C.

JEE Main · 2024 · 04 Apr 2024 · Shift 1 · Single correct option

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