The observer is moving with velocity v_0 towa | vedclass

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

Question

(A) According to the Doppler effect,when the observer moves towards a stationary source with velocity $v_0$,the apparent frequency $n^{\prime}$ is giv

Vedclass · Accepted Answer

$\frac{2 n v_0}{v}$

Vedclass · Answer

(A) According to the Doppler effect,when the observer moves towards a stationary source with velocity $v_0$,the apparent frequency $n^{\prime}$ is given by $n^{\prime} = n \left( \frac{v + v_0}{v} \right)$.When the observer moves away from the stationary source with velocity $v_0$,the apparent frequency $n^{\prime \prime}$ is given by $n^{\prime \prime} = n \left( \frac{v - v_0}{v} \right)$.The difference between the apparent frequencies is $\Delta n = n^{\prime} - n^{\prime \prime}$.Substituting the values: $\Delta n = n \left( \frac{v + v_0}{v} \right) - n \left( \frac{v - v_0}{v} \right)$.$\Delta n = \frac{n}{v} (v + v_0 - v + v_0) = \frac{n}{v} (2 v_0) = \frac{2 n v_0}{v}$.

Similar Questions

The driver of a bus approaching a big wall notices that the frequency of his bus's horn changes from $420\, Hz$ to $490\, Hz$,when he hears it after it gets reflected from the wall. Find the speed of the bus (in $kmh^{-1}$) if the speed of sound is $330\, ms^{-1}$.

$A$ whistle $S$ of frequency $f$ revolves in a circle of radius $R$ at a constant speed $v$. What is the ratio of maximum and minimum frequency detected by a detector $D$ at rest at a distance $2R$ from the center of the circle as shown in the figure?

$A$ boy standing on a platform observes the frequency of a train horn as it passes by. The change in the frequency noticed as the train approaches and recedes him with a velocity of $108 \text{ km/h}$ is (speed of sound in air $= 330 \text{ m/s}$) (in $\%$)

Vedclass Test Series

Exam Paper Generator

Online Exam Module