What is the ralation connecting absorpative, reflecting and transmitting power of a body ?

What is (i) the absorbing power and (ii) the reflecting power of a 'perfect black body' ?

From Kirchoff's law the ratio of emissive power and absorption power of all bodies-

A travelling wave is partly reflected and partly transmitted from a rigid boudary. Let a_(i),a_(r)and a_(t) be the amplitude of incident wave, reflected wave and transmitted wave and I_(i),I_(r)and I_(t) be the corresponding intensities. Then choose the correct alternatives

When q_(1) joules of radiation is incident on a body if reflects and transmits total of q_(2) joules. Find the emissivity of the body.

A body is kept inside a container the temperature of the body is T_(1) and the temperature of the container is T_(2) the rate at which body absorbs the energy is alpha The emissivity of the body is e The radiation striking the body is either absorbed or reflected At what rate of body will absorb the radiant energy .

What is the advantage of such kind of reflection?

A wave pulse, travelling on a two piece string, gets partically reflected and partically transmitted at the junction, The reflected wave is inverted in shape as compard to the incident one. If the incident wave has speed v and the transmitted wave v'

Determine the light pressure exerted on the walls of an electric bulb of power 100 W . The bulb is made in the form of a sphere of radius 5cm , its walls reflect 10 % of the incident light and the rest 90% of the light is transmitted. Assume that the entire power consumed by the bulb is converted into radiation and transmitted light does not exert any pressure.

A progrssive wave travels in a medium M_(1) and enters into another medium M_(2) in which its speed decreased to 75% . What is the ratio of the amplitude of the (a). Reflected and the incident waves , and (b). Transmitted and the incident waves ?

Two equal resistances when connected in series to a battery ,consume electric power of 60 W .If these resitances are now connected in parealled combination to the same battery ,the electric power cansumed will be :