First slide

Photo Electric Effect

Question

The kinetic energy of electron is E when incident light has wavelength $λ .$ To increase the kinetic energy to 2E, the incident light must have wave length

Moderate

Solution

$\frac{h c}{λ} = h v_{o} + E a n d \frac{h c}{x} = h v_{o} + 2 E s o l v i n g, x = \frac{h c λ}{E λ + h c}$

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