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Question

Which of the following are not electromagnetic waves?


A

Gamma rays

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B

X-rays

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C

Beta rays

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D

Cosmic rays

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Solution

The correct option is C

Beta rays


The explanation of the correct option:

Electromagnetic Waves:

  1. An electromagnetic wave is a wave radiated by an oscillatory charge in which a varying magnetic field is the source of the electric field and a varying electric field is the source of the magnetic field.
  2. Both fields are perpendicular to each other.
  3. These fields are also perpendicular to the direction of propagation of the wave.
  4. Beta rays are emitted by radioactive elements and are not part of the electromagnetic spectrum.

The explanation for the incorrect options:

Gamma-ray, X-ray, and cosmic rays are part of the electromagnetic spectrum.

Therefore, option C is the correct choice.


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