This slide is prepared for the students of class nine to teach digitally to make learning fun. First I uploaded sound slide in nepali but found some font problem. So i prepared in english medium as well.

1. Welcome to the
students of class 9

2. Science
Sound
Presenter
Somnath Sitaula (Suman)
Shree Nanda Secondary School, Godak

3. Sources of sound

4. Overview of the content
s

5. Sound is the form of energy
Introduction of sound
Sound gives the sensation of hearing
Sound is produced due to the vibration of the particles present
in the body
The object should vibrate to produce
sound

6. sound energy propagates from one palce to
another in the form of wave
t
Sound can propagate in
solid,liquid and gas medium
Material Medium is required to propagate
sound from one place to another place

7. Sound wave is a
longitudinal wave
1
Sound wave is a mechanical wave
because it needs material medium to
propagate
2
The region where the density
of particle is maximum is
Compression
3
The region where the density
of particle is minimum is
Rarefaction.
4
Sound wave+

8. Types of wave
longitudinal
wave
Transverse
wave

9. Longitudinal wave+

10. Transverse wave

11.  In longitudinal wave the
direction of propagation of wave
and the direction of vibration of
particles are same
This wave can propagate in
solid, liquid and gaseous
medium.
 sound wave, primary wave of
earthquake etc
 In transverse wave the
direction of propagation of wave
and the vibration of the particles
are perpendicular to each other
This wave can propagate only
in solid and liquid medium
Water wave, secondary wave of
earthquake etc

12. Frequency is the number of
complete cycle in 1sec
The time taken to make
one complete cycle
wave length is the distance
between two successive
crests and troughs
It is the maximum distance
moved by the vibrating body
from its means position
Frequency
;dofjw
Wave
length
Amplitude
Time period
SignM f
SI unitMHz
Sign MT
SI unit{M s
signM λ
SI unitM m
SignMa
SI unitM m

13. Maximum
speed
SolidLiquidGas
Minimum
speed
Faster then gas
but slower then
solid
Speed of sound in different medium

14. Density of airO
1
O
2
Temperature of air
O
3
Humidity of air

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16. Importance of
ultrasound
Blood-less
surgery{
To
identify
state of
embryo
To
determine
depth of sea
To kill
bacteria{

17. Echo
Reberberation

18.  It is the prolongation of the
sound after mixing with original
sound
The distance between the
source of sound and reflecting
surface should be lesser then
17m
The speed of reverberation is
greater then original sound
 It is the repetitions of the sound
after striking on the reflecting
surface
The distance between the
source of sound and reflecting
surface should be greater then
17m
The speed of echo is lesser then
the original sound

19. To detect the
position of weapons
by military
To determine depth of
the sea
To determine the
position of baby in
the worm
In medical to
identify tumors,
stones etc
Importance of reflection of sound

20. The process of bending of sound waves when traveling from one medium to another medium is
called refraction of sound.
Refraction of
sound in day
Refraction of
sound in night

21. The distance travelled by the sound wave per
unit time is called speed of sound
Its SI unit is m/s
Speed of sound = f x λ

22. Plantation of
trees]{
Use of Silencer
Public
awareness]
Use of ear muff
Control
measures
Noise pollution is the propagation of noise with
ranging impact on human or animal health

23. Difficulty in
communication
Lack of
concentration
Increase in
blood pressure
Mental illness

24. Thank you for
your active
participation