A tuning fork and sonometer give 5 beats per second when the length of the wire is 1 m and 1.05 m respectively. The frequency of fork is -

1. 210 Hz

2. 205 Hz

3. 410 Hz

4. 420 Hz 

Subtopic:  Beats |
 58%
From NCERT
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The two nearest harmonics of a tube close at one end and open at the other end are \(220~\text{Hz}\) and \(260~\text{Hz}\). What is the fundamental frequency of the system?
1. \(10~\text{Hz}\) 2. \(20~\text{Hz}\)
3. \(30~\text{Hz}\) 4. \(40~\text{Hz}\)
Subtopic:  Standing Waves |
 64%
From NCERT
NEET - 2017
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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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A source of unknown frequency gives 4 beats/s when sounded with a source of known frequency 250 Hz. The second harmonic of the source of unknown frequency gives five beats per second when sounded with a source of frequency 513 Hz. The unknown frequency is

(1) 254 Hz

(2) 246 Hz

(3) 240 Hz

(4) 260 Hz

Subtopic:  Beats |
 75%
From NCERT
NEET - 2013
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Two sources of sound placed close to each other, are emitting progressive waves given by

y1=4 sin 600πt and y2=5 sin 608 πt

An observer located near these two sources of sound will hear

(a)4 beats per second with intensity ratio 25:16 between waxing and waning

(b) 8 beats per second with intensity ratio 25:16 between waxing and waning

(c) 8 beats per second with intensity ratio 81:1 between waxing and waning

(d) 4 beats per second with intensity ratio 81:1 waxing and waning

Subtopic:  Beats |
 54%
From NCERT
NEET - 2012
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A train moving at a speed of 220 ms-1 towards a stationary object, emits a sound of frequency 1000 Hz. Some of the sound reaching the object gets reflected back to the train as an echo. The frequency of the echo as detected by the driver of the train is
(speed of sound in air is 330 ms-1)
1. 3500Hz
2. 4000Hz
3. 5000Hz
4. 3000Hz

Subtopic:  Doppler's Effect (OLD NCERT) |
 65%
From NCERT
NEET - 2012
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Two particles are oscillating along two close parallel straight lines side by side, with the same frequency and amplitudes. They pass each other, moving in opposite directions when their displacement is half of the amplitude. The mean positions of the two particles lie on a straight line perpendicular to the paths of the two particles. The phase difference is :

(1)zero                                 

(2)2π3

(3)π                                     

(4)π6

Subtopic:  Wave Motion |
 55%
From NCERT
NEET - 2011
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Two waves are represented by the equations y1=asinωt and y2=acosωt. The first wave 

(1) Leads the second by π

(2) Lags the second by 2π

(3) Leads the second by π2

(4) Lags the second by π2

Subtopic:  Wave Motion |
 62%
From NCERT
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How many degrees of freedom the gas molecules have if, under \(\text{STP}\), the gas density \(\rho = 1.3~\text{kg/m}^3\) and the velocity of sound propagation in it is \(330~\text{ms}^{-1}\)?
1. \(3\)       
2. \(5\)         
3. \(7\)             
4. \(8\)

Subtopic:  Speed of Sound |
 67%
From NCERT
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A tuning fork makes 256 vibrations per second in air. When the velocity of sound is 330 m/s, then the wavelength of the tone emitted is :

1. 0.56 m

2. 0.89 m

3. 1.11 m

4. 1.29 m

Subtopic:  Standing Waves |
 80%
From NCERT
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