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

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?

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|Exercise Linked Comprehension Type|3 Videos

  • PHOTOELECTRIC EFFECT

    CENGAGE PHYSICS|Exercise Integer Type|4 Videos

  • PHOTOELECTRIC EFFECT

    CENGAGE PHYSICS|Exercise Single Correct Answer Type|7 Videos

  • NUCLEI

    CENGAGE PHYSICS|Exercise QUESTION BANK|59 Videos

  • RAY OPTICS

    CENGAGE PHYSICS|Exercise DPP 1.6|12 Videos

Similar Questions

Explore conceptually related problems

The threshold wavelength for photoelectric emission from a material is 5200 Å . Photoelectrons will be emitted when this material is illuminated with monochromatic radiation from a (a) 50 W infrared lamp (b) 1 W infrared lamp (c ) 50 W ultraviolet lamp (d) 1 W ultraviolet lamp .

The threshold wavelength for photoelectric from a material is 5200 Å photoelectric will be emittillumnated with when this meterial is illiuminated with monecharnatic radiation from a

Threshold wavelength of a photoelectric emission from a material is 600nm. Which of the following illuminating source will emit photoelectrons?

The threshold wavelength for a photosensitive metal plate is 5000 Å. Photoelectrons will be emitted from it if it is irradiated by light from a

The threshold wavelength for a metal is 5000 Å . The maximum K.E. of the photoelectrons emitted when ultraviolet ligh of wavelength 2500 Å falls on it is

The threshold wavelength for photoelectric emission in tungsten is 2300 Å. What wavelength of light must be used to eject electrons with a maximum energy of 1.5 eV?

The threshold wavelength for emission of photoelectrons from a metal surface is 6xx10^(-7)m .The work function of the material of the metal surface is.

Knowledge Check

  • The threshold wavelength for photoelectric emission from a material is 5200 Å. Photoelectrons will be emitted when the material is illuminated with monochromatic radiation from a

    A
    50 W infrared lamp
    B
    1 W red coloured laser light.
    C
    0.1 W ultraviolet lamp
    D
    10 W power sodium lamp.

  • The threshold wavelength for photoelectric from a material is 5200 Å photoelectric will be emittillumnated with when this meterial is illiuminated with monecharnatic radiation from a

    A
    `50 `watt infrared lamp
    B
    `1` - watt infra- red lamp
    C
    `50 `watt ubraviolet lamp
    D
    `1` - watt ahraviolet lamp

  • Threshold wavelength of a photoelectric emission from a material is 600nm. Which of the following illuminating source will emit photoelectrons?

    A
    400W,, infrared lamp
    B
    10W, ultraviolet lamp
    C
    100W, ultraviolet lamp
    D
    Both B & C