How do mechanical waves differ from electromagnetic waves?
Here are some points which show how mechanical waves differ from electromagnetic waves -
|Mechanical Waves||Electromagnetic waves|
|1. Mechanical waves need a material medium for their propagation. These waves cannot travel through vacuum.||1. Electromagnetic waves do not need any material medium for their propagation. These waves can travel through vacuum.|
|2. Speed of mechanical waves are low and depends upon the source and the medium through which they travel.||2. Electromagnetic waves travel with the speed of light (3 x 108 m/ s) in vacuum. The speed of an electromagnetic wave in any material medium is less than that in vacuum.|
|3. Mechanical waves are due to the vibrations of the particles of the medium.||3. Electromagnetic waves are due to the oscillating electrical and magnetic fields in space.|
|4. Mechanical waves may be longitudinal or transverse waves.||4. Electromagnetic waves are transverse waves.|
|5. Examples: Sound waves, water waves, and string waves are mechanical waves.||5. Examples: Light waves, radio and TV waves, and X-rays are electromagnetic waves.|