Why a body with large reflectivity is a poor emitter?
Can the temperature of a body be negative on the Kelvin
scale?
The earth without its atmosphere would be inhospitably
old Fynlain.
Answers
Explanation:
(a) A body with a large reflectivity is a poor absorber of light radiations. A poor absorber will in turn be a poor emitter of radiations. Hence, a body with a large reflectivity is a poor emitter.
b An optical pyrometer calibrated for an ideal black body radiation gives too low a value for temperature of a red hot iron piece kept in the open.
Black body radiation equation is given by:
E=σ(T
4
−T
0
4
)
c. (d) Without its atmosphere, earth would be inhospitably cold. In the absence of atmospheric gases, no extra heat will be trapped. All the heat would be radiated back from earth’s surface.
Answer:
a. The body whose reflectivity is large would naturally absorb less heat. So a body with large reflectivity is a poor emitter.
b. Nope , the temperature of body cannot be negative on Kelvin. It is because the absolute zero on the Kelvin scale is the minimum possible temperature.
c. The atmosphere serve purpose of a blanket over the earth and it does not allow earth's heat to be radiated during night.
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