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  • The threshold wavelength for photoelectric emission from a material is 5500A. Photoelectrons will be emitted, when this material is illuminated with monochromatic radiation from a (A) 75 W i

The threshold wavelength for photoelectric emission from a material is 5500A. Photoelectrons will be emitted, when this material is illuminated with monochromatic radiation from a
(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:
 

Option: 1

B and C only 


Option: 2

A and D only
 


Option: 3

C only 


Option: 4

C and D Only


Answers (1)

best_answer

\begin{aligned} & \lambda_0=5500 \AA \rightarrow \phi_0=\frac{12400}{5500}=2.25 \mathrm{eV} \\ & \phi=3.6 \times 10^{-19} \mathrm{~J} \end{aligned}

the photoelectric effect will occur if the wavelength of the incident wave is less than the threshold wavelength. So u. v. rays will be useful for emission.
So both U.V. ray lamps can be used.

Posted by

Sanket Gandhi

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