What is a wave?
Wave is a disturbance
which travels through a medium (like liquid)
when the particles of the medium set neighbouring particles into motion.
The particles do not move, but the disturbance is carried forward from one particle to other
Mechanical Waves and Electromagnetic Waves
What are Mechanical Waves
Those waves which require a medium to propagate are called Mechanical Waves
Sound waves can travel through a medium like solid, liquid, gas
It cannot travel through a vacuum
What are Electromagnetic Waves
Those waves which do not require a medium to propagate are called Electromagnetic Waves
Light does not require a medium to propagate
It can travel even through vacuum
Difference between Sound Waves and Light Waves
|It is a mechanical wave||It is an electromagnetic wave|
|It requires a medium, it can not travel through vacuum||It can travel even in vacuum|
|It is a longitudinal waves (wave which move back and forth, parallel to direction of propagation)||It is a transverse waves (wave which move perpendicular to direction of propagation)|
Why are sound waves called mechanical waves?
Link to Q2 Page 163