When the wavelength of the radiation falling on a metal is changed from 500nm to 200 nm, the maximum kinetic energy of the photoelectrons becomes three times larger. The work function of the metal is…

Question

When the wavelength of the radiation falling on a metal is changed from 500nm to 200 nm, the maximum kinetic energy of the photoelectrons becomes three times larger. The work function of the metal is close to

Accepted Answer

Correct answer: C. (c) K_1= hc ⋋_1- _0 K_2= hc ⋋_2- _0 ∵K_2=3K_1 ⇒3( hc500- _0)= hc200- _0 ⇒ _0=0.61eV

$When the wavelength of the radiation falling on a metal is changed from 500nm to 200 nm, the maximum kinetic energy of the photoelectrons becomes three times larger. The work function of the metal is close to$

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