If the intensity of incident radiowaves of `1W m^-2` is reflected by a surface, calculate radiation pressure exerted on the surface.

The electromagnetic waves of intensity 4.5 xx 10^(-3) W m^(-2) fall on a surface and are completely absobed.Find teh pressure exerted by the radiation.

About 5% of the power of a 100 W light bulb is converted to visible radiation. What is the average intensity of visible radiation at a distance of lm from the bulb? Assume that the radiation is emitted isotropically and neglect reflection.

About 5% of the power of a 100 W light bulb is converted to visible radiation. What is the average intensity of visible radiation at a distance of 10 m? Assume that the radiation is emitted isotropically and neglect reflection.

Light with enregy flux of 18 W cm^(-2) ,find the average force the surface has an area of 20 cm^2 ,find the average force exerted on the surface during a 30 minutes time span.

A metal cuboid of mass 'M' kg rests on a table with surface are of 40cm^2 in contact with the table. The pressure exerted by the cuboid on the table surface is 10000 Pa. Value of m is (given that g = 10ms^-2)

Light with enrgy flux of 9 xx 10^5 W m^(-2) falls of a non - refleting surface at normal incidence.If trhe surface has an area of 50 cm^2 ,find average force exerted on the surface during an intervl of 10 minutes.How will the result get modified ,if the surface is a perfect reflector?

An electromagnetic wave of length lambda is incident on a photosensitive surface of negligible work function. If the photoelectrons emitted from the surface have the same de-Broglie wavelength lambda , prove that lambda=(2mc)/h lambda_1^2

A small point object is placed in air at a distance of 60 cm from the convex spherical refracting surface of refractive index 1.5.If radius of curvatrure of the spherical surface is 25 cm,calculate the power of the refracting surface.

An EM wave of intensity 'I' falls on a surface kept in vacuum and exerts radiation pressure p on it. Which of the following are true?

A point source S emitting light of wavelength 600 nm is placed at a very small height h above a flat reflecting surface AB [Fig.6.07].The intensity of the reflected light is 36% of the incident intensity.Interfrerence fringes are observed on a screen placed parallel to the reflecting surface at a very large distance D from it. If the intensity t pint P corresponds to a maximum,calculate the minimum distance through which the reflecting surface AB sould be shifted so that the intensity at P again becomes maximum.