Home
Class 12
PHYSICS
The threshold wavelength for photoelectr...

The threshold wavelength for photoelectric emission from a material is 5200 Å. Photoelectrons will be monochromatic radiation from a

A

50 W infrared lamp

B

1 W infrared lam

C

50 W ultraviolet lamp

D

1 W ultraviolet lamp

Text Solution

Verified by Experts

The correct Answer is:
C, D
The threshold wavelength is `5200A`. For ejectrion of electrons, the wavelength of the light should be less than `5200A` so that frequency increases and hence the energy of incident photon increases. UV light has less wavelength that `5200A`
Promotional Banner

Topper's Solved these Questions

  • PHOTOELECTRIC EFFECT

    CENGAGE PHYSICS ENGLISH|Exercise Linked Comprehension Type|3 Videos

  • PHOTOELECTRIC EFFECT

    CENGAGE PHYSICS ENGLISH|Exercise Integer Type|4 Videos

  • PHOTOELECTRIC EFFECT

    CENGAGE PHYSICS ENGLISH|Exercise Single Correct Answer Type|7 Videos

  • NUCLEAR PHYSICS

    CENGAGE PHYSICS ENGLISH|Exercise ddp.5.5|14 Videos

  • RAY OPTICS

    CENGAGE PHYSICS ENGLISH|Exercise DPP 1.6|12 Videos

Similar Questions

Explore conceptually related problems

The threshold wavelength for photo electric emission from a material is 5000A^(0) . Photo electrons will be emitted when the material is illuminated with monochromatic radiation from

The threshold wavelength for photoelectric emission for a material is 5200 A^(@) . Will the photoelectrons be emitted when this material is illuminated with monochromatic radiation from 1 watt ultra violet lamp?

The threshold wavelength for photoelectric emission for a material is 5200 A^(@) . Will the photoelectrons be emitted when this material is illuminated with monochromatic radiation from 1 watt ultra violet lamp?

Threshold wavelength for photoelectric effect on sodium is 5000 Å . Its work function is

The threshold wavelength for ejection of electrons from a metal is 250 nm. The work function for the photoelectric emission from the metal is

The threshold wavelength for ejection of electrons from a metal is 230 nm. The work function for the photoelectric emission from the metal is

The threshold wavelength for ejection of electrons from a metal is 350 nm. The work function for the photoelectric emission from the metal is

The threshold wavelength for ejection of electrons from a metal is 450 nm. The work function for the photoelectric emission from the metal is

The threshold wavelength for ejection of electrons from a metal is 280 nm. The work function for the photoelectric emission from the metal is

The threshold wavelength for ejection of electrons from a metal is 650 nm. The work function for the photoelectric emission from the metal is