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Let a light of wavelength lamda and inte...

Let a light of wavelength `lamda` and intensity 'I' strikes a metal surface to emit x electrons per second. Average energy of each electron is 'y' unit. What will happen to 'x' and 'y' when (a). `lamda` is halved (b) intensity I is doubled?

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(a) The rate of emission of electrons is independent of wavelength. Hence 'x' will be unaffected when `lambda` is halved
Kinetic energy of photo-electrons = Absorbed energy - Thereshold energy
`Y=(hc)/(lambda)-W_(0)`
When `lambda ` is halved, average kinetic energy will increase but it will not become double.
(b) When intensity 'I' is doubled, the rate of emission of electrons also becomes double. However, average kinetic energy will be unaffected.
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