Chapter 9.5

Question 1

Doppler effect

Answer 1

The change in observed frequency of a wave which happens whenever there is relative motion between the source and the observer

Question 2

Formula for frequency when a source is moving towards an observer

Answer 2

f′ = f[v/(v - u)]

v = speed of emitted wave
u = speed of source

Question 3

Formula for wavelength when a source is moving towards an observer

Answer 3

λ′ = λ(1 - u/v)

u = speed of source
v = speed of emitted wave

Question 4

Formula for frequency when a source is moving away from an observer

Answer 4

f′ = f[v/(v + u)]

v = speed of emitted wave
u = speed of source

Question 5

Formula for wavelength when a source is moving away from an observer

Answer 5

λ′ = λ(1 + u/v)

u = speed of source
v = speed of emitted wave

Question 6

Formula for frequency when an observer is moving towards a source

Answer 6

f’ = f[(v + u)/v]

v = speed of emitted wave
u = speed of observer

Question 7

Formula for frequency when an observer is moving away from a source

Answer 7

f’ = f[(v - u)/v]

v = speed of emitted wave
u = speed of observer