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Standard XII

Physics

I vs V - Varying Intensity

Photoelectric...

Question

Photoelectric effect experiments are performed using three different metal plates p, q and r having work functions $Φ_{p} = 2.0 e V, Φ_{q} = 2.5 e V a n d Φ_{r} = 3.0 e V$ respectively. A light beam containing wavelengths of 550 nm, 450nm and 350nm with equal intensities illuminates each of the plates. The correct I - V graph for the experiment is : [Take hc = 1240 eV nm]

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Solution

The correct option is B

intensity is same for all the wavelengths, hence current would remain same.The difference between the energy of photon and work function is proportional to the stopping potential.the difference would be greatest for p plate .

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Photoelectric effect experiments are performed using three different metal plates p,q and r having work functions $ϕ_{p} = 2.0 e V, ϕ_{q} = 2.5 e V a n d ϕ_{r} = 3.0 e V$ , respectively. A light beam containing wavelengths of 550 nm, 450 nm and 350 nm with equal intensties illuminates each of the plates. The correct I-V graph for the experiment is (IIT-JEE-2009)

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