SarkariPYQ

SSC CGL 2019 PYQ — Question 49

SSC CGL - 11th June 2019 - Shift 2 • General Awareness • Q49

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Which instrument is used to measure the intensity of light produced by an unknown source in terms of a standard source?

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Correct answer: B

Explanation

The correct answer is option 2, i.e Photometer. 

____ is used to measure the intensity of light produced by an unknown source in terms of a standard source.

Photometer

What Is Photometer?  
  • Photometer, a device that measures the strength of electromagnetic radiation in the range from ultraviolet to infrared and including the visible spectrum. 
  • Such devices are generally transducers that convert an electric current into a mechanical indication—e.g., a pointer moving across a dial.
  • They may be used directly, as in photography or in measuring glare, colour variation, reflectance, or other qualities, or they may be incorporated into such devices as densitometers, spectrographs, and telescopes.