Question

The source for the infrared radiations is
1) High pressure hydrogen discharge lamp
3) Mixture of rare earth oxides
2) Tungsten filament incandescent lamp
4) Mercury vapour lamp​

Answer 1

Explanation:

Since the primary source of infrared radiation is heat or thermal radiation, any object which has a temperature radiates in the infrared. Even objects that we think of as being very cold, such as an ice cube, emit infrared.

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