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Fig. shows the variation of stopping pot...

Fig. shows the variation of stopping potential `V_0` with the frequency v of the incident radiation for two photosenstive metal P and Q:
(i) Explain which metal has smaller threshold wavelength

(ii) Explain, giving reason, which metal emits photoelectrons having smaller kinetic energy, for the same wavelength of incident radiation.
(iii) If the distance between the light source and metal P is doubled, how will the stopping potential change.

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