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Thermal Expansion of Solids

poor absorber...

Question

poor absorbers and reflectors of heat

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Solution

Light, shiny surfaces are poor absorbers and poor emitters of radiation. This is why it is best to wear bright white clothes on a hot day as they reflect the heat and reduce absorption of the heat energy.

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State True or False :

Shining bodies are poor absorbers or good reflectors of heat.

Q. Black surface are poor reflectors of heat. True or false.

Q. Complete the following:
(a) Heat transfer in solids is by ................., in liquids is by .................. and in gases is by ................. .
(b) Good absorbers are ......................... radiators.
(c) Black (or dull) surfaces are ................ reflectors, but ............... absorbers of heat.
(d) Highly polished surfaces are .............. .
(e) Heat radiations differ from visible light in ............... .

Q. Assertion : Good Reflectors are poor emitters of Thermal Radiation
Reason : The ratio of the emissive power and absorptive power is constant for all substances at any given temperature and radiation of same wavelength

Q. Statement-1:Good reflectors are poor emitters of thermal radiation.
Statement-2:The ratio of the emissive power (e) and absorptive power(a) is constant for all substances at any given temperture and for radiation of the same wavelength

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