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JEE Main & Advanced Physics Transmission of Heat Question Bank Radiation General Kirchoff's law Black body

  • question_answer
    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                                         [CPMT 1988]

    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

    Correct Answer: B

    Solution :

               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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