The sound is the form of energy, which is produced by vibration of molecules of a body. Sound travels in the form of a wave. Like light, it also undergoes reflection, refraction etc.
The path of energy, through which the energy travels is called a wave. The wave can also be defined as the periodic disturbance of the particles of the medium. The waves can be classified into two types’ mechanical waves and electromagnetic wave. Mechanical waves can be propagated only in material medium whereas electromagnetic waves do not require any material medium for propagation.
when a stone is dropped into a pool of water, circular waves spread out on all directions on the surface from the center of disturbance. There are circular regions called crest, where the water level is above the normal level and there are other circular regions, called trough, where the water level is below the normal level. Water waves on the surface of water are the examples of wave motion.
If a rope held horizontally, is fixed at one end and the free end is moved up and down at right angle, a disturbance consisting of a series of crests and troughs travel along the rope.
A wave of compression and rarefaction, by which sound is propagated in an elastic medium such as air is known as sound wave.
Disturbance set up in a medium is called a wave and the propagation of disturbance, without involving transfer of any material within it, is called wave motion.
Waves can be classified into two types on the basis of the nature of the vibration in particles of the medium. They are transverse wave and longitudinal wave.
Comparison of transverse and longitudinal wave
|Vibrations of particles of a medium are perpendicular to the direction of propagation of wave.||Vibrations of particles of a medium are along the direction of propagation of wave.|
|These waves can be generated in solids and liquids.||These waves can be generated in solids, liquids and gases.|
|A complete wave consists of a crest and trough||A complete wave consists of a compression and rarefaction.|
|It can travel in vacuum.||It cannot travel in vacuum.|
|Speed of this wave is more.||Speed of this wave is less.|
image source:http://lh3.ggpht.com/-tX6BKR8nUBI/Uf8fnKlf8OI/AAAAAAAAHSE/L8k31m6xw5o/Difference between Longitudinal wave and Transverse wave_thumb.jpg?imgmax=800
The sound wave carries energy from a vibrating object as kinetic energy of the particles of material medium (solid, liquid or gas), so sound waves are called mechanical waves.
Sound waves are mechanical waves that need material medium to carry energy from the sources. So, they cannot travel in vacuum.
|Transverse wave||Longitudinal wave|
Sound cannot travel in vacuum because sound is a mechanical wave that needs material medium to transfer energy.
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