Home
Class 12
PHYSICS
A collimated beam of light of flux densi...

A collimated beam of light of flux density `30kWm^(-2)` is incident normally on `100mm^(2)` completely absorbing screen. If P is the pressure exerted on the screen and `trianglep` is the momentum tranferred to the screen during a 1000 s interval, then

A

`P = 10^(-3)Nm^(-2)`

B

`P = 10^(-4)Nm^(-2)`

C

`Deltap = 10^(-4)kgms^(-1)`

D

`Deltap = 10^(-5)kgms^(-1)`

Text Solution

Verified by Experts

Doubtnut Promotions Banner Mobile Dark
|

Topper's Solved these Questions

  • PHOTOELECTRIC EFFECT AND MATTER WAVES

    PHYSICS GALAXY - ASHISH ARORA|Exercise Unsolved numerical problems|42 Videos

  • PHOTOELECTRIC EFFECT AND MATTER WAVES

    PHYSICS GALAXY - ASHISH ARORA|Exercise Numerical MCQs|60 Videos

  • NUCLEAR PHYSICS AND RADIOACTIVITY

    PHYSICS GALAXY - ASHISH ARORA|Exercise Concptual MCQs|48 Videos

  • THERMODYNAMICS LAWS & SPECIFIC HEATS OF GASES

    PHYSICS GALAXY - ASHISH ARORA|Exercise Practice Exercise 3.4|11 Videos

Similar Questions

Explore conceptually related problems

" of intensity "1.5kW/m^(2)" is incident normally on a perfectly absorbing surface.The pressure exerted by the light on the surface is "n times10^(-6)Pa" .Value of "n" is "

State one feature by which the phenomenon of interference can be distinguished from that of the diffraction. A parallel beam of light of wavelength 600 nm is incident normally on a slit of width 'a'. If the distance between the slit and the screen is 0.8m and the distance of second order maximum from the centre of the screen 15 mm, calculate the width of the slit.

Knowledge Check

  • Light is incident normally on a completely absorbing surface with an energy flux of 25 Wcm^(-2) If the surface has an area of 25 cm^(2) the momentum transferred to the surface in 40 min time duration will be:

    A
    `6.3 xx 10^(-4) Ns`
    B
    `5.0 xx 10^(-3) Ns`
    C
    `1.4 xx 10^(-6) Ns`
    D
    `3.5 xx 10^(-6) Ns`

  • A parallel beam of light of wavelength 600 nm is incident normally on a slit of width d. If the distance between the slits and the screen is 0.8 m and the distance of 2^(nd) order maximum from the centre of the screen is 15 mm. The width of the slit is

    A
    `40 mu m`
    B
    `80 mu m`
    C
    `160 mu m`
    D
    `200 mu m`

  • Light of wavelength 6328 Å is incident normally on a slit of width 0.2 mm. Angular width of the central maximum on the screen will be :

    A
    `0.9^(@)`
    B
    `0.18^(@)`
    C
    `0.54^(@)`
    D
    `0.36^(@)`

    • Similar Questions

    Explore conceptually related problems

    A parallel beam of light of wavelenght 600 nm is incident normally on a slit of width 'd' . If the distance between the slit and screen is 0.8 m and distance of 2nd order maximum from the centre of the screen is 15mm , calculate the width of the slit.

    Light of wavelength 6328 Å is incident normally on a slit of width 0.2 mm. Calculate the angular width of central maximum on a screen distance 9 m?

    (a) A parallel beam of monochromatic light of wavelength 500 nm is incident normally on a perfectly absorbing surface. The power through any cross section of the beam is 10 W. Find (i) the number of photons absorbed per second by the surface and the force exerted by the lilght beam on the surface. (a) Radiation of wavelength 200 nm, propagating in the form of a parallel beam, fall normally on a plane metallic surface. The intensity of the beam is 5 mW and its cross-sectional area is 1.0 mm^(2) . Find the pressure exerted by the radiation on the metallic surface if the radiation is completeley reflected. (c) 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 1.0xx10^(19) . Calculate the force exerted by the light beam on the mirror. (d) A beam of white light is incident normally on a plane surface absorbing 70%) of the light and reflecting the rest. If the incident beam carries 10 W of power, find the force exerted by it on the surface.

    Light with an energy flux of 18W//cm^(2) falls on a non-reflecting surface at normal incidence. The pressure exerted on the surface is

    Light of wavelength 6328 Å is incident normally on a slit having a width of 0.2 mm . The distance of the screen from the slit is 0.9 m . The angular width of the central maximum is

    Home
    Profile