Question

You are holding a siren, and you hear a frequency of 1200 Hz from it when you are standing still. You now move directly toward a cliff wall at a speed of 1/5 the speed of sound. What frequency do you hear as an echo from the cliff wall?

Answer 1

`F_w=1000Hz`

Step-by-step explanation:

From the question we are told that:

Frequency
`F=1200`

Speed
`V_w= (1)/(5)*343=>68.6m/s`

Where speed of sound
`V_s=343m/s`

Generally the equation for frequency that echo from the cliff wall is mathematically given by

`F_w=(V_s-V_0)/(Vs+V_w)*F`

`F_w=(343-0)/(343+68.6)*1200`

`F_w=1000Hz`