# Doppler effect (the sound source moving towards observer)

1. Aug 8, 2014

### desmond iking

1. The problem statement, all variables and given/known data

the observer is stationary , but the sound source is moving towards the observer , i was told that the speed of sound relative to the observer doesnt change. why is it so ? in my opinion, the speed of sound relative to observer changed . because of v= f x (lambda) , as the frequency of sound is fixed , but the wavelength of sound waves now changed , (the wavelength now become shorter) , so the speed of sound realtive to the obersver is reduced . am i correct ?

2. Relevant equations

3. The attempt at a solution

2. Aug 8, 2014

### Simon Bridge

The speed of sound in a medium is a property of the medium, not the source or the observer.