this is simple study for sound

1. Dr.Aida
SOUND WAVE

2. WAVE
INTERACTIONS

3. Longitudinal Wave
wave particles vibrate back
and forth along the path that
the wave travels.
Compressional Wave

4.  Compressions
The close together part of the wave
 Rarefactions
The spread-out parts of a wave

5. Transverse waves
wave particles vibrate
in an up-and-down motion.

6. Crests
Highest part of a wave
Troughs
The low points of the wave

7. Amplitude-
is the maximum distance
the particles in a wave
vibrate from their rest positions.
Frequency
- the number of waves
produced in a given time

8. Frequency= waves/time

9. Wave Velocity - is the speed with which a
wave crest passes by a particular point in
space
It is measured in meters/second.
Wave Velocity = Frequency Wavelength

10.  Medium velocity m/sec
air (20 C) 343
air (0 C) 331
water (25 C) 1493
sea water 1533
diamond 12000
iron 5130
copper 3560
glass 5640

11. II. Properties of Sound

12. Pitch
- description of how high or low
the sound seems to a person
. Loudness-
how loud or soft a sound is
perceived to be.

13. Sound Loudness (dbs) Hearing
Damage
Average Home 40-50
Loud Music 90-100 After long
exposure
Rock Concert 115-120 Progressive
Jet Engine 120-170 Pain

14. Ultrasound
- sound waves with frequencies above the
normal human range of hearing.
Sounds in the range from 20-100kHz
Infrasound
- sounds with frequencies below the
normal human range of hearing.
Sounds in the 20-200 Hz range

16.  the result of two or more sound
 waves overlapping

17. Different sounds that you hear include
(A) noise, (B) pure tones, and (C) musical
notes.

22. Doppler Effect
is the apparent change in the
frequency of a sound caused by
the motion of either the listener
or the source of the sound.

24.  Sounds from Moving Sources.
 A moving source of sound or a moving observer
experiences an apparent shift of frequency called
the Doppler Effect.
 If the source is moving as fast or faster than the
speed of sound, the sound waves pile up into a
shock wave called a sonic boom.
 A sonic boom sounds very much like the pressure
wave from an explosion

27. Resonance
the frequency of sound waves
exactly matches the natural frequency
of an object.

30. Wave length, 500 to 600 km in ocean

31.  On December 26, they were playing in the sea when
Tilly suddenly found the water was bubbling, like on
top of a beer. She immediately realized tsunami was
coming because the scene reminded her of a geography
lesson about Hawaii's 1946 tsunami.
 Right away, Tilly told her parents, sister and other
tourists to escape quickly, but at first they were in half
belief. However, seeing Tilly's serious and firm
expression, people started to be convinced of the
seriousness of the thing and instantly left the beach.
 At last over 100 tourists were ended up in safety with
no death

32. THANK YOU
Dr.Aida