Practicing Success
Practicing Success
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Light of wavelength λ strikes a photo-sensitive surface and electrons are ejected with kinetic energy E. If the kinetic energy is to be increased to 2E, the wavelength must be changed to λ' where - |
$λ'=\frac{λ}{2}$ $λ'=2λ$ $\frac{λ}{2}<λ'<λ$ $λ'>λ$ |
$\frac{λ}{2}<λ'<λ$ |
If $λ'=λ/2 ⇒E_2>2E_1$ But here $E_2>2E_1$ So $λ'=λ/2$ So answer is $λ>λ'>λ/2$ |
