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Q: The amount of radiation mainly depends upon the -
  • A. Nature of the body
  • B. Temperature of the body
  • C. Type of surface of the body
  • D. All of the above
Correct Answer: Option D - Radiation is a method of heat transfer that is not related with any contact between the heat source and the heated object. It depends on nature of the body, its temperature and kind and extent of its surface.
D. Radiation is a method of heat transfer that is not related with any contact between the heat source and the heated object. It depends on nature of the body, its temperature and kind and extent of its surface.

Explanations:

Radiation is a method of heat transfer that is not related with any contact between the heat source and the heated object. It depends on nature of the body, its temperature and kind and extent of its surface.