Question

After giving an intense performance, a confused and disoriented flautist has wandered onto the motorway! They are playing a constant 300Hz on their flute and are essentially stationary If you are driving along the motorway at 100 km/h(27.8 m/s). What is the frequency you hear from the flautist's you hear from the flautist's instrument before you pass them and after you pass them?

Coincidently the horn on your car, which you sound as you narrowly miss the flautist in the problem above , also give a constant 300 Hz. tone. What frequency does the flautist hear before and after you pass them?

Answer 1

so for the first part of the question.. I used f=((C+Vr)/c)*fs for moving towards and when its moving away, the sign changes to negative instead of positive right?

But for the second part of the question,,, what formula do i use here? im a little confused here!

Answer 2

Flutist hears the difference or "beat" frequency

http://hyperphysics.phy-astr.gsu.edu/hbase/sound/beat.html