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The work function of a metal is in the r...

The work function of a metal is in the range of 2 eV to 5 eV. Find which of the following wavelength of light cannot be used for photoelectric effect. (Consider, Planck's constant `=4xx10^(-15)" eV - s, velocity of light "=3xx10^(8)ms^(-1))`

A

510 nm

B

650 nm

C

400 nm

D

570 nm

Text Solution

Verified by Experts

The correct Answer is:
B
`lamda =(hc)/phi`
`lamda_("min") = (4xx10^(-15) xx3 xx10^8)/(5eV) = 240 nm`
`lamda_("max") = (4xx10^(-15) xx3 xx10^8)/(2eV) = 600 nm`
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