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Q: Which instrument is used to measure the intensity of light produced by an unknown source in terms of a standard source?
  • A. Dynamometer
  • B. Calipers
  • C. Photometer
  • D. Ammeter
Correct Answer: Option C - Photometer is used to measure the intensity of light produced by an unknown source in terms of a standard source. The photometer is a scientific instrument that was invented by Edward Charl's pickering. It is used to compare the illumination intensity of two light sources while ammeter is an instrument to measure the current flowing in an electric circuit.
C. Photometer is used to measure the intensity of light produced by an unknown source in terms of a standard source. The photometer is a scientific instrument that was invented by Edward Charl's pickering. It is used to compare the illumination intensity of two light sources while ammeter is an instrument to measure the current flowing in an electric circuit.

Explanations:

Photometer is used to measure the intensity of light produced by an unknown source in terms of a standard source. The photometer is a scientific instrument that was invented by Edward Charl's pickering. It is used to compare the illumination intensity of two light sources while ammeter is an instrument to measure the current flowing in an electric circuit.