Waves Lecture 5

Question 1

how does a wave behave at a fixed boundary

Answer 1

reflects upside down

Question 2

how does a wave behave at a free boundary

Answer 2

2x amplitude and reflects right way up

Question 3

when a wave moves into a lighter density does it speed up or slow down

Answer 3

speeds up

Question 4

what are the conditions for a boundary wave to be partially reflected and partially transmitted

Answer 4

y must be continuous and ∂y/∂x must be continuous

Question 5

what does y_reflected =

Answer 5

yr = (v2 - v1 / v2 +v2 ) yi

Question 6

what does y_transmitted =

Answer 6

yt = (2v2 / v1+v2) yi

Question 7

what does impedance mean

Answer 7

ration of vertical force to transverse speed

Question 8

what is the equation for impedance

Answer 8

z= Fy/Vy = sqrt (µT)

Question 9

when a wave travels to a different medium what do speed, wavelength and frequency do

Answer 9

frequency = fixed
speed = changes
wavelength = changes