JEE Main & Advanced Physics Transmission of Heat Question Bank Topic Test - Transmission of Heat (3-5-21)

  • question_answer
    There is a rough black spot on a polished metallic plate. It is heated upto 1400 K approximately and then at once taken in a dark room. Which of the following statements is true

    A) In comparison with the plate, the spot will shine more

    B) In camparison with the plate, the spot will appear more black

    C) The spot and the plate will be equally bright

    D) The plate and the black spot can not be seen in the dark room

    Correct Answer: A

    Solution :

    The black spot on heating absorbs radiations and so emits them in the dark room while the polished shining part reflects radiation and absorbs nothing and so does not emit radiations and becomes invisible in the dark.

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