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Summary Sounds and waves Physics1008A Block 3 R165,33   Add to cart
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Summary Sounds and waves Physics1008A Block 3
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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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  • May 17, 2024
  • 3
  • 2022/2023
  • Summary

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SOUND
Llongitudinal
↓ 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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