(B) For an observer moving towards a stationary source,the observed frequency is given by $n_1 = n_0 \left[ \frac{v + v_L}{v} \right]$.For a source mo

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more in the second case than in the first case.

(B) For an observer moving towards a stationary source,the observed frequency is given by $n_1 = n_0 \left[ \frac{v + v_L}{v} \right]$.For a source moving towards a stationary observer,the observed frequency is given by $n_2 = n_0 \left[ \frac{v}{v - v_s} \right]$.Substituting the values $v = 330 \,m/s$,$v_L = 50 \,m/s$,and $v_s = 50 \,m/s$:$n_1 = n_0 \left[ \frac{330 + 50}{330} \right] = n_0 \left[ \frac{380}{330} \right] \approx 1.151 n_0$.$n_2 = n_0 \left[ \frac{330}{330 - 50} \right] = n_0 \left[ \frac{330}{280} \right] \approx 1.178 n_0$.Comparing the two results,we find that $n_2 > n_1$.Therefore,the frequency heard will be more in the second case than in the first case.

Class 11 Physics Waves Doppler’s Effect

Easy

Consider the Doppler effect in two cases. In the first case,an observer moves towards a stationary source of sound with a speed of $50 \,m/s$. In the second case,the observer is at rest and the source moves towards the observer with the same speed of $50 \,m/s$. Then the frequency heard by the observer will be [velocity of sound in air $= 330 \,m/s$.]

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A
same in both the cases.
B
more in the second case than in the first case.
C
less in the second case than in the first case.
D
less than the actual frequency in both the cases.

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The engine of a train moving with speed $10\,ms^{-1}$ towards a platform sounds a whistle at frequency $400\,Hz$. The frequency heard by a passenger inside the train is $........\,Hz$ (neglect air speed. Speed of sound in air $330\,ms^{-1}$). (in $,Hz$)

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$A$ highway truck has two horns $A$ and $B$. When sounded together, the driver records $50$ beats in $10$ seconds. With horn $B$ blowing and the truck moving towards a wall at a speed of $10 \,m/s$, the driver notices a beat frequency of $5 \,Hz$ with the echo. When the frequency of $A$ is decreased, the beat frequency with the two horns sounded together increases. Calculate the frequency of horn $A$. (Speed of sound in air $= 330 \,m/s$) (in $\,Hz$)

DifficultTS EAMCET 2019

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An observer is standing $500 \,m$ away from a vertical hill. Starting between the observer and the hill, a police van sounding a siren of frequency $1000 \,Hz$ moves towards the hill with a uniform speed. If the frequency of the sound heard directly from the siren is $970 \,Hz$, the frequency of the sound heard after reflection from the hill (in $Hz$) is about, (velocity of sound $= 330 \,m/s$):

DifficultAP EAMCET 2006

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An observer moves towards a stationary source of sound with a speed $\frac{1}{5}$th that of sound. The frequency of the sound emitted by the source is $f$. The apparent frequency recorded by the observer is

EasyTS EAMCET 2023

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$A$ whistle of frequency $500 \, Hz$ tied to the end of a string of length $1.2 \, m$ revolves at $400 \, rev/min$. $A$ listener standing some distance away in the plane of rotation of the whistle hears frequencies in the range (speed of sound $= 340 \, m/s$):

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The engine of a train moving with speed $10\,ms^{-1}$ towards a platform sounds a whistle at frequency $400\,Hz$. The frequency heard by a passenger inside the train is $........\,Hz$ (neglect air speed. Speed of sound in air $330\,ms^{-1}$). (in $,Hz$)

An observer moves towards a stationary source of sound with a speed $\frac{1}{5}$th that of sound. The frequency of the sound emitted by the source is $f$. The apparent frequency recorded by the observer is

$A$ whistle of frequency $500 \, Hz$ tied to the end of a string of length $1.2 \, m$ revolves at $400 \, rev/min$. $A$ listener standing some distance away in the plane of rotation of the whistle hears frequencies in the range (speed of sound $= 340 \, m/s$):

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