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Electromagnetic Spectrum

Which one of ...

Question

Which one of the following has the longest wavelength?

A

Radio waves

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B

Sound waves

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C

X-rays

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D

Infra-red ray

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Solution

The correct option is A Radio waves
Answer is A.
Radio waves have the longest wavelength of all electromagnetic waves. Their size can vary from a foot to a few miles long. Radio waves are used to transmit data for all sorts of things; radios, satellites, radar etc.

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