Doppler effect Flashcards
1
Q
What is the doppler effect
A
The apparent change in frequency of a wave due to the relative motion of a source and an observer
2
Q
observed frequency equation explain each symbol
A
f’ = f((v±v_o)/(v±v_s))
letters after _ are subscripted
f’ = observed frequency
f = frequency of sound
v = speed of sound
v_o = speed of observer
v_s = speed of source
3
Q
when observer moving
A
v + v_o (closer to source)
v – v_o (further from source)
4
Q
when source moving
A
v – v_s (closer to observer)
v + v_s (further from observer) and
5
Q
uses of doppler effect
A
measuring speeds of vehicles
sirens
6
Q
experiment to measure speed of moving car with doppler effect
A
- the doppler effect states that the observed and emitted frequency are different due to relative velocity
- waves are reflected off the car, causing a doppler shift
- wavefronts squished, wavelengths shorten frequency increases
- wave speed remains the same