VIBRATION
AND WAVE
Vibration is defined as the oscillating motion of the body regularly through the equilibrium point.
One Vibration : A – B – A – C - A
Amplitude Of Vibration : A – B , A – C
Period and Frequency of Vibration
n Period (T)
n Time
for every vibration
n Time
of all vibration divided number of
vibration
n T = t/n
n The
unit in SI is second (s)
n T = 1/f
n Frequency (f)
n Number
of vibration every 1 second
n Number
of vibration divided time of all vibration
n f = n/t
n The
unit in SI is hertz (Hz)
n f = 1/T
n Amplitude of vibration is not influency number of period and frequency of vibration
n the
meaning of wave is the
vibration propagates to bring energy
n TRANSVERSAL WAVE
n Direction
of vibration is perpendicular to direction of propagation
n The
wave on seawater surface
n The
ripple of water
n The
light wave
n The radio wave, TV, HP
n The
wave on the rope vibrates perpendicular to direction of propagation
n LONGITUDINAL WAVE
n Direction
of vibration is coincident to direction of propagation
n The
wave in the seawater
n The
sound wave
n The
wave of slinky
n vibrates by
coincident to direction of propagation
ABCD = compression
TRANSVERSAL WAVE
n Hill
of wave = ABC
n Valley
of wave = CDE
n Peak of wave = B,
F
n Bottom
of wave = D
n Amplitude =
B B1
n One
wave = A B C D E
n Wavelength(λ) =
A E
n (λ) = Lamda
n Wavelength
is the distance travelled by
wave in one period or the length of one wave
n Wave
Period is time
needed to pass one wave
n Wave
frequency is the number of
wave formed in 1 second.
n Speed
of wave is the distance passed
by wave within 1 second.
Speed of wave (v) is the distance passed by wave within 1 second.
V= λ.f v
= λ /T
where
:
λ = Wavelength,
its unit is
meter (m).
T = Period
, its unit is sekon (s).
f = frequency, its unit is Hertz (Hz)
Property of Wave :
n Wave
can reflected ( reflection ).
Wave can reflected ,if a wave hits obstacle wall.
Example: the light wave, the water wave, the sound wave, etc.
n Wave
can refracted ( refraction )
Wave can refracted, in this case the light wave, if through two optic medium is different its dencity by the angle.
Example : the light
wave from air to water by the gradient
angle.
n Wave
can defracted ( Defraction).
Example :
The sound wave,
Its
prove, we can hear the sound from a room through very thin hole.
The light wave, its prove is the image of thin
narrow hole dropped on the floor appear in wide.
n Wave
can interferenced (interferency).
Exercise:
1.The number of peaks and valleys at the wave picture above are....
2. Look at the picture In question number 1. Its amplitude and the
period are respectively....
3. The period of wave, if its wavelength is 5 m and its speed is 10
m/s, is ....
4. Look at the picture!
5. Look at the followng figure of a pendulum. A motion of 1 vibrations
is shown as the following successive motion ......
6. The number of vibrations performed in every second is . . . .
7. If the frequency of a vibration is 4 Hz, the period of such a
vibration is . . . .
8. The following is considered as a transverse wave, except . . . .
9. The number of waves are performed in each second is called. . . .
10. If the vibration direction is perpendicular to the direction of
wave propagation, it means that the wave is a/an . . . .
11. Look at the picture!
12 m
The wavelength of the wave is . . . .
12. A pendulum performs swings with the number of vibrations 20 times
in 10 seconds. The frequency is . . . .
