- #1
physics user1
Think at a cop car with a siren that moves with a velocity Vc, it emits a sound with a velocity C
Now think about a person that doesn't move, in front of the cop car, shouldn't he register that the speed of the sound emited is Vs= Vc+ C?
According to the galileian equations (true for v <<c light)
x= x' + Vc t (distance done by the sound wave according to the guy in front of the cop car)
x'= Ct (distance done by the sound wave according to the cop car frame of reference)
x= (C+ Vc) t
d/dt x = d/dt [ (C+Vc) t]
Vs= C + Vc
Is that correct? Does the speed of the wave change with the frame of reference?
Is because of that that the frequency changes? (Doppler effect)
Now think about a person that doesn't move, in front of the cop car, shouldn't he register that the speed of the sound emited is Vs= Vc+ C?
According to the galileian equations (true for v <<c light)
x= x' + Vc t (distance done by the sound wave according to the guy in front of the cop car)
x'= Ct (distance done by the sound wave according to the cop car frame of reference)
x= (C+ Vc) t
d/dt x = d/dt [ (C+Vc) t]
Vs= C + Vc
Is that correct? Does the speed of the wave change with the frame of reference?
Is because of that that the frequency changes? (Doppler effect)