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Q: What are infra-red rays ?
  • A. Longitudinal waves
  • B. Transverse waves
  • C. Mechanical waves
  • D. Electromagnetic waves
Correct Answer: Option D - British astronomer William Herschel discovered infra-red light in 1800, according to NASA. Infra-red is a type of electromagnetic radiation. From highest to lowest frequency, electromagnetic radiation includes gamma-rays, X-rays, ultraviolet radiation, visible light, infra-red radiation, microwaves and radio waves. Together, these types of radiation make up the electromagnetic spectrum.
D. British astronomer William Herschel discovered infra-red light in 1800, according to NASA. Infra-red is a type of electromagnetic radiation. From highest to lowest frequency, electromagnetic radiation includes gamma-rays, X-rays, ultraviolet radiation, visible light, infra-red radiation, microwaves and radio waves. Together, these types of radiation make up the electromagnetic spectrum.

Explanations:

British astronomer William Herschel discovered infra-red light in 1800, according to NASA. Infra-red is a type of electromagnetic radiation. From highest to lowest frequency, electromagnetic radiation includes gamma-rays, X-rays, ultraviolet radiation, visible light, infra-red radiation, microwaves and radio waves. Together, these types of radiation make up the electromagnetic spectrum.