Home
Class 12
PHYSICS
Monochromatic light of wavelength 3000 Å...

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

Text Solution

Verified by Experts

` I = (nhc)/(lambda A) xx (1)/(t)` (Intensity is energy crossing per unit area per unit time )
` (n)/(t) = (I lambda A)/(hc) = ((150) xx 10^(-3) xx 4 xx 10^(-4) xx 3 xx 10^(-7))/( 6.6 xx 10^(-34) xx 3 xx 10^(6)) = 9 xx 10^(13)` per second
Promotional Banner

Topper's Solved these Questions

  • ALTERNATING CURRENT

    AAKASH INSTITUTE ENGLISH|Exercise Try Yourself|15 Videos

  • ALTERNATING CURRENT

    AAKASH INSTITUTE ENGLISH|Exercise Assignment (Section - A) ( Objective Type Questions ( One option is correct))|40 Videos

  • ATOMS

    AAKASH INSTITUTE ENGLISH|Exercise ASSIGNMENT SECTION J (Aakash Challengers )|5 Videos

Similar Questions

Explore conceptually related problems

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.

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

Light of wavelength 3000Å is incident on a metal surface whose work function is 1 eV. The maximum velocity of emitted photoelectron will be

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.

Stopping potential of emitted photo electron is V when monochromatic light of wavelength 'lamda' incident on a metal surface. If wavelength of light incident becomes 'lambda/3' stopping potential of photoelectrons becomes V/4 then the threshold wavelength of metal is k'lambda' then k will be

Light of wavelength 3000 Å falls on a sensitive surface. If the surface has received 10^-7 J of energy, then the number of photons falling on the surface area is