Home
Class 12
PHYSICS
Two separate monochromatic light beams A...

Two separate monochromatic light beams A and B of the same intensity are falling normally on a unit area of a metallic surface. Their wave lengths are `lamda_(A)` and `lamda_(B)`, respectively. Assuming that all the incident light is used in ejecting the photoelectrons the ratio of the photoelectrons from the beam A to that from B is :

A

`(lamda_(A)//lamda_(B))^(2)`

B

`(lamda_(B)//lamda_(A))^(2)`

C

`(lamda_(A)//lamda_(B))`

D

`(lamda_(B)//lamda_(A))1`

Text Solution

Verified by Experts

The correct Answer is:
C
Doubtnut Promotions Banner Mobile Dark
|

Topper's Solved these Questions

  • DUAL NATURE OF RADIATION AND MATTER

    AAKASH SERIES|Exercise EXERCISE=II|42 Videos

  • CURRENT ELECTRICITY

    AAKASH SERIES|Exercise EXERCISE - III|73 Videos

  • ELECTRIC CHARGES AND FIELDS

    AAKASH SERIES|Exercise Practice Exercise|57 Videos

Similar Questions

Explore conceptually related problems

A monochromatic light of wavelength lamda is incident on an isolated metallic sphere of radius a. The threshold wavelength is lamda_(0) , which is larger than lamda . Find the number of photoelectrons emitted before the emission of photo electrons stops.

Monochromatic light of wavelength 589 nm is incident from air on a water surface. What are the wavelength, frequency and speed of (a) reflected, and (b) refracted light ? Refractive index of water is 1.33.

Knowledge Check

  • K_(1) and K_(2) are the maximum kinetic energies of the photo electrons emitted when light of wave lengths lamda_(1) , and lamda_(2) , respectively are incident on a metallic surface. If lamda_(1)=3lamda_(2) then

    A
    `K_(1)gt(K_(2))/(3)`
    B
    `K_(1)lt(K_(2))/(3)`
    C
    `K_(1)gt3K_(2)`
    D
    `K_(2)=3K_(1)`

  • Two satellite A and B revolve round the earth in circular orbits at heights R_(A) and R_(B) respectively from the surface of the earth. If the radius of the earth is R_(E) , the ratio of magnitude of the velocities fo the satellites is

    A
    `sqrt((R_(B) + R_(E))/(R_(A) + R_(E)))`
    B
    `(R_(B) + R_(E))/(R_(A) + R_(E))`
    C
    `sqrt((R_(B))/(R_(A)))`
    D
    `(R_(B))/(R_(A))`

  • Photoelectric emission is observed from a metallic surface for frequencies v_(1) and v_(2) of the incident light (v_(1)gtv_(2)) .If the maximum values of kinetic energy of the photoelectrons emitted in the two cases are in the ratio 1:n, then the threshold frequency of the metallic surface is

    A
    `(v_(1)-v_(2))/((n-1)`
    B
    `(nv_(1)-v_(2))/((n-1)`
    C
    `(nv_(2)-v_(1))/((n-1)`
    D
    `(v_(1)-v_(2))/((n-1)`

    • Similar Questions

    Explore conceptually related problems

    A beam of 10.6 V photons of intensity 2.0W//m^(2) falls on a platinum surface of area 1.0xx10^(-4)m^(2) and work function 5.6eV. If 0.53% of the incident photons eject photo electrons, then find the number of photoelectrons emitted per second and their minimum and maximum energies (in eV).

    Two solid steel cylinders A and B of same temperature (higher than the surrounding temperature) are of same length and of radii r and 2r, respectively. Only radiation considered, if the rate of all of temperature of A is k, then the rate of fall of temperature B would bne

    A parallel beam of monochromatic light of frequency v is indcident on a surface. The intensity of the beam is I and area of the surface is A. Find the force exerted by light of beam on the surface is perfectly reflecting and the light beam is incident at an angle of incidence theta . (The speed of light is denoted as c.)

    Photoelectric emission is observed from a metallic surface for frequencies v_(1) and v_(2) of the incident light rays (v_(1)gtv_(2)) .If the maximum value of kinetic energy of the photoelectrons emitted in the two cases are in the ratio 1:k,then the threshold frequency of the metallic surface is

    A parallel monochromatic beam of light is incident formed on a narrow slit diffraction pattern is formed on screen palced perpendicular to the direction of the incident beam . At the first minimum of the diffraction pattern , the phase difference between the rays coming from the two edges of the slit of

    Home
    Profile