What is the difference between Mechanical wave and Electro magnetic wave?
Difference between sound wave and light waves(radio wave)????(Tabular Form).

1) Difference between mechanical wave and electromagnetic wave: Unlike electromagnetic waves, mechanical waves need a medium to travel. Further, mechanical waves don't polarize but electromagnetic waves get polarized. Electromagnetic waves have electrical and magnetic components oscillating in mutually perpendicular direction where as mechanical waves propagatet in the form of compressions and rarefactions. Example of mechanical wave is sound. Example of electromagnetic wave is light .

2) Difference between sound waves and light waves:

	Sound wave	Light wave
1.	Sound waves are mechanical waves.	Light waves are electromagnetic waves.
2.	Its velocity in air is 340m/s.	Its velocity in air is 3×10⁸ m/s.
3.	These are logitudinal waves i.e. move in compression and rarefaction.	These are transverse waves i.e. move in crest and trough forms.
4.	They need medium to travel.	They do not need medium to travel.
5.	The denser the medium more will be speed of sound.	The denser the medium less will be the speed of light.

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Electromagnetic waves:-
These do not require a medium for their transmission. They are made from an electric and amagnetic fieldoscillating at right angles to each other. Examples of these would be light, X rays, ultra violet, microwaves etc.
These do not require a medium for their transmission. They are made from an electric and amagnetic fieldoscillating at right angles to each other. Examples of these would be light, X rays, ultra violet, microwaves etc.
Mechanical waves:-
These would be set up within a solid, a liquid ora gasdue to the vibration of the molecules there. They are transmitted by both intermolecular forces and by collisions between the molecules. In solids they could be either longitudinal or transverse vibrations while in a liquid or a gas only longitudinal vibrations are really possible. Examples of these waves would be the P and S waves in the Earth's crust due to an earthquake and sound waves in air.These would be set up within a solid, a liquid ora gasdue to the vibration of the molecules there. They are transmitted by both intermolecular forces and by collisions between the molecules. In solids they could be either longitudinal or transverse vibrations while in a liquid or a gas only longitudinal vibrations are really possible. Examples of these waves would be the P and S waves in the Earth's crust due to an earthquake and sound waves in air.Sound Waves

1. Require a medium.

2. Travel with aspeedof 332 m/s at 0 C.

3. Are longitudinal waves consisting of compressions and rarefactions.

4. Are of different frequencies, giving notes of different pitches.

5. Do not travel far as their energy is dissipated easily.

Light Waves

1. Do not require a medium

2. Travel with a speed of 3 *10⁸m/s.

3. Areelectromagnetic wavesconsisting of varying electric and magnetic fields.

4. Are of different frequencies, resulting in different colors.

5. Can travel through a much greater distance.

Sound Waves