Which of the following statements is true/correct
A
During clear nights, the temperature rises steadily upward near the ground level
B
Newton's law of cooling, an approximate form of Stefan's law, is valid only for natural convection
C
The total energy emitted by a black body per unit time per unit area is proportional to the square of its temperature in the Kelvin scale
D
Two spheres of the same material have radii 
and 
and temperatures 4000 K and 2000 K respectively. The energy radiated per second by the first sphere is greater than that radiated per second by the second sphere
and and temperatures 4000 K and 2000 K respectively. The energy radiated per second by the first sphere is greater than that radiated per second by the second sphere
Text Solution
Verified by ExpertsThe correct answer is:
B
During clear nights object on surface of earth radiate out heat and temperature falls. Hence option is wrong.
The total energy radiated by a body per unit time per unit area E ∝ ∝ T 4 . Hence option is wrong.
Energy radiated per second is given by 
Q P 1 = P 2 , hence option is wrong.
Newton's law is an approximate form of Stefan's law of radiation and works well for natural convection.
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