A 100 W light bulb is placed at the centre of a spherical chamber of radius 20cm. Assume that 60% of the energy supplied to the bulb is converted into light and that the surface of the chamber is perfectly absorbing. Find the pressure exerted by the light on the surface of the chamber.

A 100W light bulb giving monochromatic light of wavelength 6000A^(@) is placed at the centre of a spherical chamber of radius 0.20m. Assume that 50% of the energy supplied to the bulb is converted into light and that the surface of the chamber is perfectly absorbing. Find (i) the energy and momentum of each photon in the light beam. (ii) How many photons per second, on the average arrive at the surface of spherical chamber, and (iii) The pressure exerted by the light on the surface of the chamber. Given, h=6.6xx10^(-34)Js .

" 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 "

Calculate the number of photons emitted per second by a 10 W sodium vapour lamp. Assume that 60% of the consumed energy is converted into light. Wavelengths of sodium light =590nm.

All the surface are smooth and the strings ans pulleys are light. The force exerted by the 20 cm part of the rod on the 10 cm part is

A light bulb is rated at 100 W for a 220 V ac supply . The resistance of the bulb is

If 15% of the energy supplied to a bulb is radiated as visible light, how many quanta are emitted per second by a 100 watt lamp ? Assume that the wavelength of visible light is 5600 Å .

A sphere of radius 1.00 cm is placed in the path of a parallel beam of light of large aperture. The intensity of the light is 0.50 W cm^-2 . If the sphere completely absorbs the radiation falling on it, find the force exerted by the light beam on the sphere.

If 5% of the energy supplied to a bulb is irradiated as visible light, how many quanta are emitted per second by a 100 W lamp? (Assume, wavelength of visible light as 5.6xx10^(-5)cm )

Light with intensity 20 W / cm^2 is falling along the normal on a surface , which completely abssorbs the light area of the surface is 25 cm^2 find the average force exerted y light on this surface in one hour .