Longitudinal Waves Flashcards
(8 cards)
1
Q
Longitudinal motion
A
Oscillations are parallel to wave direction
2
Q
Speed of sound in solid
A
c= root( Y/ roe) youngs modulus and density
3
Q
Solid types of waves
A
Can have both longitudinal and transverse, shear force exists between adjacent planes so transverse motion can occur
4
Q
Liquid and gas wave types
A
No shear force so only longitudinal
5
Q
Liquid c
A
Bulk modulus K, c= root(K/roe)
6
Q
Gas speed
A
Bulk modulus K_T = p and K_S= gamma p
Use K_S because fats oscillations c= root(gammap/roe)
7
Q
Wavefronts
A
Equally spaced, surface of constant phase
Plane or circular, 3D= spherical
8
Q
Doppler effect for sound
A
Moving source f’= f/ 1+ v/c positive is away negative is towards
Moving observer f’ = (1+ v/c)f positive is towards negative is away
