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Question

# For photo-electric effect with incident photon wavelength λ, the stopping potential is V0. Identify the correct variation(s) of V0 with λ and 1/λ.

A
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B
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C
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D
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Solution

## The correct option is C Maximum kinetic energy of the photon is given by hcλ=eV0+ϕ where ϕ is the work function. On solving further, V0=hce(1λ)−ϕe(which is equation of a straight line ) and the relation between V0 and λ is V0∝1λ which shows straight line graph. Hence option C is correct. Now the relation between stopping potential (V0) and λ. From the equation, hcλ=eV0+ϕ When, λ→0,V0→∞λ→λthreshold, V0→0 So, option A is correct.

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