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Q.

The threshold wavelength for photoelectric emission from a material is $5500 Å$ . Photoelectrons will be emitted, when this material is illuminated with monochromatic radiation from a $(λ o f v i o l e t < 5000 Å)$
A.      75 W infra – red lamp
B.     10 W infra – red lamp
C.     75 W ultra – violet lamp
D.     10 W ultra – violet lamp
Choose the correct answer from the options given below :

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a

B and C only

b

C only

c

A and D only

d

C and D only

answer is D.

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Detailed Solution

$λ < 5500 Å$ for photoelectric effect $λ_{v i o l e t} < 5500 Å$

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The threshold wavelength for photoelectric emission from a material is 5500Å. Photoelectrons will be emitted, when this material is illuminated with monochromatic radiation from a λ of violet<5000ÅA. 75 W infra – red lamp B. 10 W infra – red lampC. 75 W ultra – violet lampD. 10 W ultra – violet lampChoose the correct answer from the options given below :