Three musicians experiment with the Doppler effect. Musician $A$ rides in a car at a speed $u$ directly away from musician $B$ who is stationary. Musician $C$ rides in a car directly toward $B$ and travels at the same speed as $A$. Musician $A$ plays a note at frequency $f_A$ on his trumpet. $B$ hears the note,adjusts his trumpet,and plays the same note he heard. Choose the incorrect statement.
- AThe note heard by $C$ coming from $B$ will be the same pitch as $f_A$.
- BThe note heard by $A$ coming from $B$ will be higher in pitch than $f_A$.
- CThe note heard by $A$ coming from $B$ will be lower in pitch than $f_A$.
- DThe note heard by $B$ coming from $A$ will be lower in pitch than $f_A$.
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Similar Questions
Match Column-$A$ with Column-$B$.
Column-$A$ Column-$B$ $(a)$ When source of sound and listener move towards wall. $(i)$ Listener would hear a sound with same frequency as that of source. $(b)$ When source of sound and listener move away from each other. $(ii)$ Listener would hear a sound with frequency smaller than that of source. $(iii)$ Frequency of echo would be greater than that of source.
| Column-$A$ | Column-$B$ |
| $(a)$ When source of sound and listener move towards wall. | $(i)$ Listener would hear a sound with same frequency as that of source. |
| $(b)$ When source of sound and listener move away from each other. | $(ii)$ Listener would hear a sound with frequency smaller than that of source. |
| $(iii)$ Frequency of echo would be greater than that of source. |
Easy
View Solution$A$ stationary source of sound $A$ is producing sound of frequency $170 \, Hz$. Another source of sound $B$ producing sound of frequency $240 \, Hz$ is moving towards the source $A$ on a straight path with a uniform speed of $20 \, ms^{-1}$. An observer between $A$ and $B$ is moving towards the source $A$ along the straight path $BA$. If the number of beats heard by the observer is zero, the speed of the observer is . . . . . . $ms^{-1}$. (Speed of sound in air $= 340 \, ms^{-1}$).
DifficultAP EAMCET 2017
View Solution$A$ train approaching a railway crossing at a speed of $120 \ km/h$ sounds a whistle of frequency $576 \ Hz$,when it is $288 \ m$ away from the crossing. The frequency heard by an observer standing on the road perpendicular to the track at a distance of $384 \ m$ from the crossing is (Speed of sound in air $= 340 \ m/s$): (in $Hz$)
DifficultAP EAMCET 2019
View SolutionThe 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 the reflected sound as heard by the driver is .... $Hz$
Medium
View SolutionAn observer moves towards a stationary source of sound with a velocity of one-fifth of the velocity of sound. The percentage increase in the apparent frequency is (in $\%$)
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