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## Homework Statement

A sound source moves at a constant velocity. A listener is standing at a distance L away from it. Given that the source moves in a straight line at a right angle to the listener and starts closest to the listener (ie at t=0) deduce an expression for the frequency heard by the listener in relation to time.

## Homework Equations

f

_{l}=f

_{s}(v/(v-v

_{s}))

where l is listener and s is source

## The Attempt at a Solution

It's obviously Doppler effect related.

So far I’ve done T=1/f

_{s}

And gotten

f

_{l}=v/T(v-v

_{s})

But unsure how to get L into the equation.

Surely VT is the distance travelled by the wave and v

_{s}T is λ

_{s}. Is there any orientation where L can be introduced? Or is this version correct?