Doppler Effect
PHXI15:WAVES

354745 A source of sound of sound is approaching an observer with speed of \(30\;m{s^{ - 1}}\) and the observer is approaching the source with a speed of \(60\;m{s^{ - 1}}.\) Then, the dfractional change in the frequency of sound is (take, speed of sound in air \( = 330\;m{s^{ - 1}}\) )

1 \(\dfrac{1}{3}\)
2 \(\dfrac{3}{10}\)
3 \(\dfrac{2}{5}\)
4 \(\dfrac{2}{3}\)
PHXI15:WAVES

354746 Statement A :
Frequency of sound wave does not change when the listener moves towards or away from stationary source.
Statement B :
The motion of source causes the apparent change in wavelength.

1 Statement A is correct but Statement B is incorrect.
2 Statement A is incorrect but Statement B is correct.
3 Both statements are correct.
4 Both Statements are incorrect.
PHXI15:WAVES

354747 Two sources of sound \(S_{1}\) and \(S_{2}\) are moving towards and away from a stationary observer with the same speed respectively. Observer detects 3 beats per second. Find the value of speed of sources (approximately) (take, \({f_1} = {f_2} = 500\;Hz\) and speed of sound in air \( = 330\;m{s^{ - 1}}\) )
supporting img

1 \(1\;m{s^{ - 1}}\)
2 \(2\;m{s^{ - 1}}\)
3 \(3\;m{s^{ - 1}}\)
4 \(4\;m{s^{ - 1}}\)
PHXI15:WAVES

354748 Two engines pass each other moving in opposite directions with uniform speed of \(30\;m/s\). One of them is blowing a whistle of frequency \(540\;Hz\). The apparent frequency of the whistle observed by the person in another engine is (speed of sound is \(330\;m/\sec \))

1 \(450\;Hz\)
2 \(540\;Hz\)
3 \(270\;Hz\)
4 \(648\;Hz\)
PHXI15:WAVES

354745 A source of sound of sound is approaching an observer with speed of \(30\;m{s^{ - 1}}\) and the observer is approaching the source with a speed of \(60\;m{s^{ - 1}}.\) Then, the dfractional change in the frequency of sound is (take, speed of sound in air \( = 330\;m{s^{ - 1}}\) )

1 \(\dfrac{1}{3}\)
2 \(\dfrac{3}{10}\)
3 \(\dfrac{2}{5}\)
4 \(\dfrac{2}{3}\)
PHXI15:WAVES

354746 Statement A :
Frequency of sound wave does not change when the listener moves towards or away from stationary source.
Statement B :
The motion of source causes the apparent change in wavelength.

1 Statement A is correct but Statement B is incorrect.
2 Statement A is incorrect but Statement B is correct.
3 Both statements are correct.
4 Both Statements are incorrect.
PHXI15:WAVES

354747 Two sources of sound \(S_{1}\) and \(S_{2}\) are moving towards and away from a stationary observer with the same speed respectively. Observer detects 3 beats per second. Find the value of speed of sources (approximately) (take, \({f_1} = {f_2} = 500\;Hz\) and speed of sound in air \( = 330\;m{s^{ - 1}}\) )
supporting img

1 \(1\;m{s^{ - 1}}\)
2 \(2\;m{s^{ - 1}}\)
3 \(3\;m{s^{ - 1}}\)
4 \(4\;m{s^{ - 1}}\)
PHXI15:WAVES

354748 Two engines pass each other moving in opposite directions with uniform speed of \(30\;m/s\). One of them is blowing a whistle of frequency \(540\;Hz\). The apparent frequency of the whistle observed by the person in another engine is (speed of sound is \(330\;m/\sec \))

1 \(450\;Hz\)
2 \(540\;Hz\)
3 \(270\;Hz\)
4 \(648\;Hz\)
NEET Test Series from KOTA - 10 Papers In MS WORD WhatsApp Here
PHXI15:WAVES

354745 A source of sound of sound is approaching an observer with speed of \(30\;m{s^{ - 1}}\) and the observer is approaching the source with a speed of \(60\;m{s^{ - 1}}.\) Then, the dfractional change in the frequency of sound is (take, speed of sound in air \( = 330\;m{s^{ - 1}}\) )

1 \(\dfrac{1}{3}\)
2 \(\dfrac{3}{10}\)
3 \(\dfrac{2}{5}\)
4 \(\dfrac{2}{3}\)
PHXI15:WAVES

354746 Statement A :
Frequency of sound wave does not change when the listener moves towards or away from stationary source.
Statement B :
The motion of source causes the apparent change in wavelength.

1 Statement A is correct but Statement B is incorrect.
2 Statement A is incorrect but Statement B is correct.
3 Both statements are correct.
4 Both Statements are incorrect.
PHXI15:WAVES

354747 Two sources of sound \(S_{1}\) and \(S_{2}\) are moving towards and away from a stationary observer with the same speed respectively. Observer detects 3 beats per second. Find the value of speed of sources (approximately) (take, \({f_1} = {f_2} = 500\;Hz\) and speed of sound in air \( = 330\;m{s^{ - 1}}\) )
supporting img

1 \(1\;m{s^{ - 1}}\)
2 \(2\;m{s^{ - 1}}\)
3 \(3\;m{s^{ - 1}}\)
4 \(4\;m{s^{ - 1}}\)
PHXI15:WAVES

354748 Two engines pass each other moving in opposite directions with uniform speed of \(30\;m/s\). One of them is blowing a whistle of frequency \(540\;Hz\). The apparent frequency of the whistle observed by the person in another engine is (speed of sound is \(330\;m/\sec \))

1 \(450\;Hz\)
2 \(540\;Hz\)
3 \(270\;Hz\)
4 \(648\;Hz\)
PHXI15:WAVES

354745 A source of sound of sound is approaching an observer with speed of \(30\;m{s^{ - 1}}\) and the observer is approaching the source with a speed of \(60\;m{s^{ - 1}}.\) Then, the dfractional change in the frequency of sound is (take, speed of sound in air \( = 330\;m{s^{ - 1}}\) )

1 \(\dfrac{1}{3}\)
2 \(\dfrac{3}{10}\)
3 \(\dfrac{2}{5}\)
4 \(\dfrac{2}{3}\)
PHXI15:WAVES

354746 Statement A :
Frequency of sound wave does not change when the listener moves towards or away from stationary source.
Statement B :
The motion of source causes the apparent change in wavelength.

1 Statement A is correct but Statement B is incorrect.
2 Statement A is incorrect but Statement B is correct.
3 Both statements are correct.
4 Both Statements are incorrect.
PHXI15:WAVES

354747 Two sources of sound \(S_{1}\) and \(S_{2}\) are moving towards and away from a stationary observer with the same speed respectively. Observer detects 3 beats per second. Find the value of speed of sources (approximately) (take, \({f_1} = {f_2} = 500\;Hz\) and speed of sound in air \( = 330\;m{s^{ - 1}}\) )
supporting img

1 \(1\;m{s^{ - 1}}\)
2 \(2\;m{s^{ - 1}}\)
3 \(3\;m{s^{ - 1}}\)
4 \(4\;m{s^{ - 1}}\)
PHXI15:WAVES

354748 Two engines pass each other moving in opposite directions with uniform speed of \(30\;m/s\). One of them is blowing a whistle of frequency \(540\;Hz\). The apparent frequency of the whistle observed by the person in another engine is (speed of sound is \(330\;m/\sec \))

1 \(450\;Hz\)
2 \(540\;Hz\)
3 \(270\;Hz\)
4 \(648\;Hz\)