Give any two points of differences between mechanical and electromagnetic waves.

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Solution

The differences between mechanical and electromagnetic waves are as follows:
Mechanical waves Electromagnetic waves
1. They require a material medium for their propagation. 1. They do not require any material medium for their propagation.
2. They cannot travel through a vacuum. 2. They can travel through a vacuum.
3. Their speed is very small, i.e., $330 m s^{- 1}$ 3. Their speed is large i.e. $3 \times 10^{8} m s^{- 1}$ .

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Mechanical waves	Electromagnetic waves
1. They require a material medium for their propagation.	1. They do not require any material medium for their propagation.
2. They cannot travel through a vacuum.	2. They can travel through a vacuum.
3. Their speed is very small, i.e., $330 m s^{- 1}$	3. Their speed is large i.e. $3 \times 10^{8} m s^{- 1}$ .