Question

All electron ejected from a surface by incident light of wavelength 200 nm can be stopped before travelling 1 m in the direction of uniform electric field of 4N/C. The work function of the surface is 

A

4eV

B

6.2eV

C

2eV

D

2.2eV

Hard

Solution

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Correct option is
D

2.2eV

The electron ejected with maximum speed  are stopped by electric field E after travelling distance d
Work done by electric field =
Photolelectric Law

 

Solve any question of Dual Nature of Radiation And Matter with:-

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