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Dual Nature of Matter

JEE Main level, single correct, medium

138 of 200

Question 138 of 200

The threshold wavelength for photoelectric emission from a material is $5500A^{^{\circ}}$ . Photoelectrons will be emitted, when this material is illuminated with monochromatic radiation from a
A. $75W$ infra-red lamp
B. $10W$ infra-red lamp
C. $75W$ ultra-violet lamp
D. $10W$ ultra-violet lamp
Choose the correct answer from the options given below :

Show answer and solution

Answer: (D) C and D only

Given here, threshold wavelength

{\lambda }_{th}=5500Å=550nm

For photoelectric emission, the wavelength of the light should be less than

550nm

.
Wavelength of infrared radiation extends from

700nm-1mm

and that of ultraviolet radiation is

100-400nm

.
Since, UV light has less wavelength than

550nm

, so only UV would be able to emit photoelectrons.

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