Question

which instrument is used to measure light intensity?a) photometer b) thermometer c) barometer d)scale​

Answer 1

Answer:

barometer

Explanation:

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Answer 2

Answer:

The instrument used to measure light intensity is a photometer.

a) photometer is the right answer.

Explanation:

• The instrument/ device used to measure the temperature is called a thermometer. Thus option b) thermometer is incorrect.

• A scientific device used to measure atmospheric pressure is called a barometer. Thus option c) barometer is incorrect.

• A scale is an apparatus generally used for measuring the length of any object. Thus option d) scale​ is incorrect.

• A photometer is a scientific device used to measure the intensity of light from an unknown source in terms of a standard source.

• It measures the strength of electromagnetic radiation in the range from UV to infrared and includes the visible spectrum.

• Photometers determine the correct exposure in photography.

• They measure Illuminance, Irradiance, light absorption, Scattering of light, Reflection of light, Fluorescence, Phosphorescence and Luminescence etc. Thus option a) photometer is correct.

Therefore, the instrument that measures light intensity is a photometer.

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