Home
Class 12
PHYSICS
Monochromatic light if wavelegath 3000 A...

Monochromatic light if wavelegath 3000 A is incident on a surface area ` 4 cm^(2)` . If intensity of light is ` 150 mW//m^(2)` , find the rate at which photons strike the target .

Text Solution

Verified by Experts

`l=(nhc)/(lambdaA)xx1/t` (Intensity is energy crossing per unit area per unit time )
`n/t=(l lambdaA)/(hc)`
`=(150xx10^(-3)xx4xx10^(-4)xx3xx10^(-7))/(6.6xx10^(-34)xx3xx10^8)`
`=9xx10^13` per second
Promotional Banner

Topper's Solved these Questions

  • DUAL NATURE OF RADIATION AND MATTER

    AAKASH INSTITUTE ENGLISH|Exercise Try Yourself|41 Videos

  • DUAL NATURE OF RADIATION AND MATTER

    AAKASH INSTITUTE ENGLISH|Exercise ASSIGNMENT SECTION A. Objective (Only one answer)|50 Videos

  • CURRENT ELECTRICITY

    AAKASH INSTITUTE ENGLISH|Exercise ASSIGNMENT SECTION-J|10 Videos

  • ELECTRIC CHARGES AND FIELDS

    AAKASH INSTITUTE ENGLISH|Exercise comprehension|3 Videos

Similar Questions

Explore conceptually related problems

Monochromatic light of wavelength 3000 Å is incident on a surface area 4 cm^(2) . If intensity of light is 150 m W//m^(2) , then rate at which photons strike the target is

Monochromatic light of wavelength 3000 Å is incident normally on a surface of area 4 cm^(2) . If the intensity of the light is 15 xx 10^(-2) W//m^(2) . The rate at which photons strike the surface is K xx 10^(13) photon/s. The value of K is _________.

Monochromatic light of wavelength 3000 Å is incident normally on a surface of area 4 cm^(2) . If the intensity of the light is 15 xx 10^(-2) W//m^(2) . The rate at which photons strike the surface is K xx 10^(13) photon/s. The value of K is _________.

A parallel beam of monochromatic light of wavelength 663 nm is incident on a totally reflecting plane mirror. The angle of incidence is 60^@ and the number of photons striking the mirror per second is 1.0 xx 10^19 . Calculate the force exerted by the light beam on the mirror.

A parallel beam of monochromatic light of wavelength 663 nm is incident on a totally reflection plane mirror. The angle of incidence is 60^@ and the number of photons striking the mirror per second is 1.0xx10^19 . Calculate the force exerted by the light beam on the mirror.

A parallel beam of uniform, monochromatic light of wavelength 6600 Å has an intensity of 900 Wm^(-2) . The number of photons in 1 mm^2 of this radiation are 1xx 10^(X) then find out value of X.

Monochromatic light of wavelength 198 nm is incident on the surface of a metal, whose work function is 2.5 eV. Calculate the stopping potential.

Monochromatic light of wavelength 580 nm is incident on a slit of width 0.30 mm. The screen is 2m from the slit . The width of the central maximum is

Monochromatic light of wavelength 632.8nm is produced by a helium-neon laser. The power emitted is 9.42 mW . (a) Find the energy and momentum of each photon in the light beam. (b) How many photons per second, on the average, arrive at a target irradiated by this beam? (Assume the beam to have uniform cross-section which is less than the target area). (c) How fast does a hydrogen atom have to travel in order to have the same momentum as that of the photon. h=6.663xx10^(-34)Js,1 a.m.u. =1.66xx10^(-27)kg .

Monochromatic light of wevelengh 589 nm in incident from air on a water surface. If mu for water is 1.33, find the wevelength, frequency and speed of the refracted light .