Question

Estimates necessary. A submarine is speeding through the water towards some emergency situation. In order to make sure it doesn't hit anything, it is "pinging" every few seconds; it's "ping" has a frequency of 450. Hz. Estimate the frequency heard by underwater, stationary listening positions along the submarine's path. (c = 1480 m/s)

Answer 1

Theory : Doppler Effect

Due to moving source of sound,the frequency of heard by a listener will be different.

This virtual frequency is given by

obsent Source $: (v-x)+ where the frequency heard t- emilled prequency Va speed of sound Vi = speed of source ist: Can't be calculated as speed of Submarine is not given." --- SHU we word.com make approximation. Consider Average speed of Submarine to be = 35 kules per hour sa is van het per seconds f = (he pas) 450 m2 = 45+6 HZ