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Question

Light of wavelength 0.6μm from a sodium lamp falls on a photo cell and causes the emission of photoelectrons for which the stopping potential is 0.5V with light of wavelength 0.4μm from a sodium lamp, the stopping potential is 1.5V, with this data the value of heis:



Your Answer
A

4×1019V.s

Your Answer
B

0.25×1015V.s

Your Answer
C

4×1015V.s

Correct Answer
D

4×108V.s


Solution

The correct option is D

4×108V.s


Equation of photo electric effect
W=W0+eV0
hc0.6=W0+e×0.5......(1)hc0.4=W0+1.5e.....(2)
(2)-(1)
hc[10.410.6]=ehc=0.20.24=ehc12=ehe=12c=123×108he=4×108Vs

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