Summary
Summary Sounds and waves Physics1008A Block 3
- Course
- Institution
This document covers everything you need to know for sound and waves covered in block 3. It provides a brief explanation and formulas needed for this section.
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SOUNDLlongitudinal
↓ 20 Hz-20kHz
waves
Frequencies
8
Sound & Waves ·
WAVES
-
-
wavelength
D na-crest
w & amplitudetrough
L transmitted medium
through or
crest +
I cannot .
vacuum
through # 2
I n medium
compressions compressions
of waves · trough
types ~T
Standing period spent full
① -> time to complete a
cycle
no energy shift = how many waves by in
requency
>
-
go a
L
spring/pendulum ↓
certain time
rare fractions
rarefractions in medium f =
↑ 35" or He
↳
atoms
making
medium vibrates to transmit sound &
Traveling Angular Frequency W= 2 f
& Ultrasonic vibrations , Above 20kHz
-
energy shifted wave Velocity a v =
1 = fx
a) Transverse T
Equation sirs
mod
Speed of sound -ov = K Wave Equation :
s rope waves
Young's mod
Y As in 10
Moving in solid-a v= Example electromagnetic waves =
- Bulk's Modulus
=
~
water waves
Moving in body of material v
Moving in
gases--v
= Y M GAMMA b) Longitudinal ~ horizontal
3 specificheavolume (ft-2)
movement
y Asinzt
S Y =
: =
T - Tension
sitete
Moving in
string--V
=
&s Mass per unit length
Example sound waves
:
Resonance :
Tendency of a
system to oscilate with greater
amplitude at some frequencies than at others When waves experience interference ~ Samea
↑ e .
.
g Pendulum TA = A + A Constructive Interferance (exactly in phase)
NODES]c n-
~
· Points =
same values of amplitudes but in
standing ↑
=
waves Amplitude = o opposite directions
a N
Wan
TA
3 standing
Same wave = o Exactly out of
phase
Opposite directions &
n7 Destructive Interference Waves
.
& D
"
x =
L =
M < TA < TA A,+Az Not constructive nor destructive interference
Fundamental frequenis
- * O =
-Anti-nodes
2 Maximum displacement (Not exactly in /out phase)
Sound intensity -
> I = Power Wim
/
-
L= colog F OR
if I
changes
↳ -Li =
colog
measured in
decibels
.
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