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    Question

    Bolometer is used to measure –

    A Frequency Correct Answer Incorrect Answer
    B Temperature Correct Answer Incorrect Answer
    C Velocity Correct Answer Incorrect Answer
    D Wavelength Correct Answer Incorrect Answer

    Solution

    A bolometer is a device for measuring the power of incident electromagnetic radiation via the heating of a material with a temperature-dependent electrical resistance. IL was invented in 1878 by the American astronomer Samuel Pierpont Langley. A bolometer consists of an absorptive element, such as a thin layer of metal, connected to a thermal reservoir (a body of constant temperature) through a thermal link.

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