- A standard Phonometer measures sound intensity. - A Photometer measures light intensity/brightness. - The options provided align with the function of a Photometer, not a Phonometer. - This suggests an error in the question's terminology.
Phonometer is used to measure which one of the following?
Asked in UPPSC Upper Mains 2014 · Topic: Measuring Instruments and Scales (Thermocouples and their applications in temperature measurement)
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Answer: A. The power of brightness oflight
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