Sound is a wave which transfers energy from one place to another. It is most easily detected via our ears and the hearing mechanism inside our head. This is a very important sense that we often take for granted. Sound is produced by the vibrations of particles through solids, liquids and gases.
Nightside clouds and disequilibrium chemistry on the hot Jupiter WASP-43b
Ch-12 (Sounds) notes.rtf (1).doc
1. Ch-12 (Sounds)
Notes:-
1.Sound is a kind of energy which is
produced by a vibrating body.
2.Sound needs material medium for
its propagation.
3.Sound can travel in solid,liquid,gas.
4.Sound cannot travel in vacuum.
5.Speed of sound is zero in vacuum.
2. 6.Sound waves are longitudinal
waves.
7.Comparison of speed of sound in
solid liquid gas
Solid
3. > Liquid > Gas
8.Charecteristics of Sounds:-
a.Frequency
b.Amplitude
c.Time period
d.Speed
9.Hearing range of human hears is
20Hz to 20,000Hz
10.Infrasonic:- Sound wave having
frequency below 20Hz is called
infrasonic.
4. 11.Ultrasonic:- Sound wave havng
freuency above 20,000Hz is called
ultrasonic.
12. Audible Range:- 20Hz to
20,000Hz
Infrasonic=0-20Hz &
Ultrasonic=Above 20,000
6. 14.Time Period:-Time taken by the
wave for one complete oscillation is
called it's time period.
It is denoted by 'T' & it's si unit is
Second (T=1/nu)
15.Wave lenght:-The distance
between two consecutive
compression or two consecutive
7. rarefaction is called
wave lenght.It is denoted by λ
& its unit is metre
16.Relation of speed , time
period , frequency & wave
