Home Physics Transmission of Heat Radiation (General, Kirchoff's Law, Black Body) On a clear sunny day, an object at temperatu…
Physics Transmission of Heat Radiation (General, Kirchoff's Law, Black Body) MCQ (Single Correct)

On a clear sunny day, an object at temperature T is placed on the top of a high mountain. An identical object at the same temperature is placed at the foot of mountain. If both the objects are exposed to sun-rays for two hours in an identical manner, the object at the top of the mountain will register a temperature

A
Higher than the object at the foot
B
Lower than the object at the foot
C
Equal to the object at the foot
D
None of the above

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Text Solution

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The correct answer is:
B

Because of uneven surfaces of mountains, most of it's parts remain under shadow. So, most of

the mountains. Land is not heated up by sun rays. Besides this, sun rays fall slanting on the mountains and are spread over a larger area. So, the heat received by the mountains top per unit area is less and they are less heated compared to planes (Foot).

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