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When p calories of heat is given to a body, it absorbs q calories; then the absorbtion power of body will be ?
(b)
In rainy season, on a clear night the black seat of a bicycle becomes wet because -
(c)
There is a rough black spot on a polished metallic plate. It is heated upto 1400 K approximately and then at once taken in a dark room. Which of the following statements is true ?
(a) The black spot on heating absorbs radiations and so emits them in the dark room while the polished shining part reflects radiation and absorbs nothing and so does not emit radiations and becomes invisible in the dark.
Which of the following is the example of ideal black body ?
(c) When light incident on pin hole, enters into the box and suffers successive reflection at the inner wall. At each reflection some energy is absorbed. Hence the ray once it enters the box can never come out and pin hole acts like a perfect black body.
A piece of blue glass heated to a high temperature and a piece of red glass at room temperature, are taken inside a dimly lit room. Then -
(c) When blue glass is heated at high temperature, it absorbs all the radiation of higher wavelength except blue. If it is taken inside a dark room, it emits all the radiation of higher wavelength, hence it looks brighter red as compared to the red piece.
Which of the following law states that “good absorbers of heat are good emitters” ?
(b) According to Kirchoff's law-
so for high emissive power, absorptive power should by high.
According to Wein's law -
(a) According to Wan's law-
On investigation of light from three different stars A, B and C, it was found that in the spectrum of A the intensity of red colour is maximum, in B the intensity of blue colour is maximum and in C the intensity of yellow colour is maximum. From these observations it can be concluded that
(c) According to Wein’s law,
The wavelength of radiation emitted by a body depends upon
(c)
Colour of shining bright star is an indication of its
(c) According to Wein’s displacement law.
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The bank mixes NEET previous year questions (PYQs) with practice questions, each tagged with its exam appearances where applicable.