Question

You are driving West at 38 m s . Ahead of you is an ambulance traveling East (towards you) at 31 m s . You hear the ambulance siren at a frequency of 411 Hz. What is the actual frequency that the ambulance is emitting

Answer 1

Answer:

The right answer is "335.18 Hz".

Explanation:

Given:

Velocity of observer,

$v_0=38 \ m/s$

Velocity of source,

$v_s=31 \ m/s$

Frequency,

$f=411 \ Hz$

As we know,

⇒  $F=(\frac{v-v_0}{v+v_s} )\times f$

        $=(\frac{343-38}{343+31} )\times 411$

        $=(\frac{305}{374} )\times 411$

        $=0.815\times 411$

        $=335.18 \ Hz$