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Which of the following rays are not electromagnetic waves
A
X-rays
B
$\gamma$-rays
C
$\beta$-rays
D
Heat rays
Detailed Solution
Electromagnetic waves are oscillating electric and magnetic fields travelling at the speed of light; they carry no charge and no rest mass.
X-rays, $\gamma$-rays and heat rays (infrared) are all parts of the electromagnetic spectrum.
$\beta$-rays are streams of fast-moving electrons emitted from nuclei in beta decay. They are charged material particles and are deflected by electric and magnetic fields.
So $\beta$-rays are not electromagnetic waves.
X-rays, $\gamma$-rays and heat rays (infrared) are all parts of the electromagnetic spectrum.
$\beta$-rays are streams of fast-moving electrons emitted from nuclei in beta decay. They are charged material particles and are deflected by electric and magnetic fields.
So $\beta$-rays are not electromagnetic waves.