The driver of a car travelling with speed 30 | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(D) The problem involves the Doppler effect with a moving source and a stationary reflecting wall,followed by the reflection acting as a source for th

Vedclass · Accepted Answer

$720$

Vedclass · Answer

(D) The problem involves the Doppler effect with a moving source and a stationary reflecting wall,followed by the reflection acting as a source for the moving observer.Step $1$: Calculate the frequency of sound incident on the hill $(f_1)$.The car acts as a moving source approaching a stationary observer (the hill).$f_1 = f 	imes \frac{v}{v - v_s}$Given $f = 600 \,Hz$,$v = 330 \,m/s$,and $v_s = 30 \,m/s$:$f_1 = 600 	imes \frac{330}{330 - 30} = 600 	imes \frac{330}{300} = 600 	imes 1.1 = 660 \,Hz$.Step $2$: Calculate the frequency of reflected sound heard by the driver $(f_2)$.The hill acts as a stationary source of frequency $f_1$,and the driver is a moving observer approaching the source.$f_2 = f_1 	imes \frac{v + v_o}{v}$Given $v_o = 30 \,m/s$:$f_2 = 660 	imes \frac{330 + 30}{330} = 660 	imes \frac{360}{330} = 2 	imes 360 = 720 \,Hz$.Thus,the frequency heard by the driver is $720 \,Hz$.

The driver of a car travelling with speed $30 \,m/s$ towards a hill sounds a horn of frequency $600 \,Hz$. If the velocity of sound in air is $330 \,m/s$,the frequency of reflected sound as heard by the driver is ........ $Hz$.

Similar Questions

The equation of the normal to the curve $y^4=ax^3$ at $(a, a)$ is

If the direction ratios of two lines are given by $3lm - 4ln + mn = 0$ and $l + 2m + 3n = 0$,then the angle between the lines is:

In the circuit shown in the figure,the power dissipated as heat in the $6\,\Omega$ resistor is $6\,W$. What is the value of resistance $R$ in the circuit? $\Omega$

If $A$ and $B$ are two events such that $A \subset B$ and $P(B) \neq 0$,then which of the following is correct?

The perimeter of a sector is a constant. If its area is to be maximum,the sectorial angle is:

Vedclass Test Series

Exam Paper Generator

Online Exam Module