Bolometer is used to measure – (1) Frequency (2) Temperature (3) Velocity (4) Wavelength

Bolometer is used to measure – (1) Frequency (2) Temperature (3) Velocity (4) Wavelength
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(2) Temperature Explanation: 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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