A siren emitting a sound of frequency 800 Hz moves away from an observer towards a cliff at a speed of 15ms-1. The frequency of sound that the observer hears in the echo reflected from the cliff will be:
(Take, velocity of sound in air=330 ms-1)
1. 800 Hz
2. 838 Hz
3. 885 HZ
4. 765 Hz

Subtopic:  Doppler's Effect (OLD NCERT) |
 61%
From NCERT
NEET - 2016
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An air column, closed at one end and open at the other, resonates with a running fork when the smallest length of the column is 50 cm. The next larger length of the column resonating with the same tunning fork is

(1) 1OO cm

(2) 150 cm

(3) 200 cm

(4) 66.7cm 

Subtopic:  Standing Waves |
 75%
From NCERT
NEET - 2016
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A uniform rope of length L and mass m1 hangs vertically from a rigid support. A block of mass m2 is attached to the free end of the ropes. A transverse pulse of wavelength λ1 is produced at the lower end of the rope. The wavelength of the pulse when it reaches the top of the rope is λ2. The ratio λ21 is-

1. m1+m2m2

2. m2m1

3. m1+m2m1

4. m1m2

Subtopic:  Travelling Wave on String |
 64%
From NCERT
NEET - 2016
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A source of sound S emitting waves of frequency 100 Hz and an observer O are located at some distance from each other. The source is moving with a speed of 19.4 ms-1 at an angle of 60° with the source observer line as shown in the figure. The observer is at rest. The apparent frequency observed by the observer (velocity of sound to air 330 ms-1), is

(1) 100 Hz

(2) 103Hz

(3) 106 Hz

(4) 97 Hz

Subtopic:  Doppler's Effect (OLD NCERT) |
 74%
NEET - 2015
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4.0 g of a gas occupies 22.4 L at NTP. The specific heat capacity of the gas at constant volume is 5.0 J K-1mol-1. If the speed of sound in this gas at NTP is 952 ms-1, then the heat capacity at constant pressure is: (Take gas constant R=8.3 JK-1mol-1)

(1) 8.0 JK-1mol-1
 

(2) 7.5 JK-1mol-1
 

(3) 7.0 JK-1mol-1
 

(4) 8.5 JK-1mol-1

Subtopic:  Speed of Sound |
From NCERT
NEET - 2015
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A string is stretched between fixed points separated by 75.0 cm. It is observed to have resonant frequencies of 420 Hz and 315 Hz. There are no other resonant frequencies between these two. The lowest resonant frequency for these strings is:

1. 155 Hz    2. 205  Hz   
3. 10.5 Hz    4. 105  Hz
Subtopic:  Standing Waves |
 76%
From NCERT
NEET - 2015
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If n1, n2 and n3 are, are the fundamental frequencies of three segments into which a string is divided, then the original fundamental frequency n of the string is given by

(1) 1/n=1/n1+1/n2+1/n3

(2) 1/√n=1/√n1+1/√n2+1/√n3

(3) √n=√n1+√n2+√n3

(4) n=n1+n2+n3

Subtopic:  Travelling Wave on String |
 70%
From NCERT
NEET - 2014
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The number of possible natural oscillations of the air column in a pipe closed at one end of a length of 85 cm whose frequencies lie below 1250 Hz is: (velocity of sound 340ms-1)

1. 4 2. 5
3. 7 4. 6
Subtopic:  Standing Waves |
 62%
From NCERT
NEET - 2014
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A speed motorcyclist sees a traffic jam ahead of him. He slows down to 36km/h. He finds that traffic has eased and a car moving in front of him at 18km/h is honking at a frequency of 1392Hz. If the speed of sound is 343m/s, the frequency of the honk as heard by him will be 
1. 1332Hz
2. 1372Hz
3. 1412Hz
4. 1454Hz 

Subtopic:  Doppler's Effect (OLD NCERT) |
 56%
From NCERT
NEET - 2014
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A wave travelling in the positive x-direction having maximum displacement along y-direction as 1m, wavelength 2π m and frequency of 1/π Hz is represented by

(1) y=sin(x-2t)

(2) y=sin(2πx-2πt)

(3) y=sin(10πx-20πt)

(4) y=sin(2πx+2πt)

Subtopic:  Types of Waves |
 84%
From NCERT
NEET - 2013
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