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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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