Sound is a mechanical wave that propagates through a medium such as air or water by transmitting pressure oscillations that are detected as sound by the organs of hearing. Sound waves are longitudinal waves that cause particles in the medium to vibrate back and forth parallel to the direction of energy transport. The speed at which sound travels depends on the properties of the medium, with denser materials like metals transmitting sound faster than gases like air. Wavelength refers to the distance between peaks of a sound or other wave as it propagates through a medium.

1. SOUND
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2. WHAT IS A SOUND?
•Sound is a mechanical wave that is n
oscillation of pressure transmitted
through a solid ,liquid ,or gas ,composed
of frequencies within the range of hearing
and of a level sufficiently strong to be
heard or the sensation stimulated in
organs of hearing by such vibrations.

3. PROPAGATION OF SOUND
• Sound is a sequence of waves of pressure which
propagates through compressible media such as air or
water. (Sound can propagate through solids as well,
but there are additional modes of propagation).
During their propagation, waves can be reflected,
refracted by the medium. The purpose of this
experiment is to examine what effect the
characteristics of the medium have on sound.

4. PROPAGATION OF SOUND

5. SOUND WAVES
• A sound wave is the pattern of disturbance caused by
the movement of energy traveling through a medium
(such as air, water, or any other liquid or solid matter)
as it propagates away from the source of the sound.
The source is some object that causes a vibration,
such as a ringing telephone, or a person's vocal
chords.

6. SOUND WAVES

7. SOUND AND MEDIUM
• Sound is a mechanical wave that results from the back and
forth vibration of the particles of the medium through which
the sound wave is moving. If a sound wave is moving from
left to right through air, then particles of air will be displaced
both rightward and leftward as the energy of the sound
wave passes through it. The motion of the particles is parallel
(and anti-parallel) to the direction of the energy transport.
This is what characterizes sound waves in air as longitudinal
waves.

8. SOUND AND MEDIUM
• Sound needs a medium to travel .It cannot travel
through vaccum.
• Each vibration compresses the molecules and that
compression propagates onwards. In order for sound
to exist, we need something to be compressed. In
space, the particles floating about probably aren't
close enough to compress and make anything audible

9. SPEED OF SOUND
MATERIAL SPEED OF SOUND
RUBBER 60m/s
AIR 355m/s
LEAD 1210m/s
GOLD 3240m/s
GLASS 4540m/s
COPPER 4600m/s
ALUMINIUM 6320m/s

10. WHAT IS WAVELENGTH?
• Forms of electromagnetic radiation like radio waves, light waves or
infrared (heat) waves make characteristic patterns as they travel
through space. Each wave has a certain shape and length. The
distance between peaks (high points) is called wavelength.

11. THE END……