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

" 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 "

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 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 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?

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 :

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