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| Q. |
Bolometer is used to measure – |
| A. | Frequency |
| B. | Temperature |
| C. | Velocity |
| D. | Wavelength |
| Answer» B. Temperature | |
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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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