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What is the work function of the metal i...

What is the work function of the metal if the light of wavelength `4000 Å` generates photoelectrons of velocity `6xx10^(5)ms^(-1)` from it ? (Mass of electron `=9xx10^(-31)kg,` Velocity of light `=3xx10^(8)ms^(-1)`, Planck’s constant `=6.626xx10^(-34)Js`. Charge of electron `=1.6xx10^(-19)JeV^(-1)`)

A

`0.9eV`

B

`3.1eV`

C

`2.1eV`

D

`2.1eV`

Text Solution

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The correct Answer is:
D
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