Waves
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Avg score: 57% • Most missed: “A transverse wave is represented by y = A sin (ωt-“kx)For what value of the wav…”
Waves
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25 Questions

1. Two waves of lengths 50 cm and 51 cm produce 12beats per secThe velocity of sound is [1999]
2. Two points are located at a distance of 10 m and 15m from the source of oscillationThe period ofoscillation is0.05 sec and the velocity of the wave is 300m/secWhat is the phase difference between theoscillations of two points? [2008]
3. In a sinusoidal wave - the time required for aparticular point to move from maximum displacementto zero displacement is0.170 secThe frequency of thewave is [1998]
4. A train moving at a speed of 220 ms -“1 towards astationary object - emits a sound of frequency 1000 Hz.Some of the sound reaching the object gets reflectedback to the train as echoThe frequency of the echo asdetected by the driver of the train is: (speed of sound inair is 330 ms-“1) [2012M]
5. The equation of a travelling wave isy = 60 cos (180t -“ 6x)where y is in microns - t in second and x in metresTheratio of maximum particle velocity to velocity of wavepropagation is [1997]
6. Two sources of sound placed close to each otherare emitting progressive waves given by y 1 = 4 sin 600πt and y2 = 5 sin 608 πtAn observer located near thesetwo sources of sound will hear: [2012]
7. A 5.5 metre long string has a mass of0.035 kgIf thetension in the string is 77N - the speed of a wave on thestring is [1989]
8. A star - which is emitting radiation at a wavelengthof 5000 Å - is approaching the earth with a velocity of1.50 × 106 m/sThe change in wavelength of theradiation as received on the earth is [1996]
9. A point source emits sound equally in all directionsin a non-“absorbing mediumTwo points P and Q are atdistances of 2 m and 3 m respectively from the source.The ratio of the intensities of the waves at P and is[2005]
10. The frequency of sinusoidal wave ξ = 0.40 cos[2000 t + 0.80] would be[1992]
11. For production of beats the two sources must have[1992]
12. What is the effect of humidity on sound waveswhen humidity increases? [1996]
13. A car is moving towards a high cliffThe car driversounds a horn of frequency fThe reflected sound heardby the driver has frequency 2fIf v be the velocity ofsound - then the velocity of the car - in the same velocityunits - will be [2004]
14. The speed of a wave in a medium is 760 m/sIf3600 waves are passing through a point in the mediumin 2 min - then their wavelength is [1995]
15. A standing wave having 3 nodes and 2 antinodes isformed between two atoms having a distance 1.21 Ã…between themThe wavelength of the standing wave is[1998]
16. An observer moves towards a stationary source ofsound with a speed 1/5th of the speed of soundThewavelength and frequency of the sound emitted are λand f respectivelyThe apparent frequency andwavelength recorded by the observer are respectively.[2003]
17. Two waves of the same frequency and intensitysuperimpose each other in opposite phasesAfter thesuperposition - the intensity and frequency of waves will[1996]
18. A wave travelling in the +ve x-direction havingdisplacement along y-direction as 1m - wavelength 2Ï€ mand frequency 1/Ï€ Hz is represented by [NEET2013]
19. Two waves are approaching each other with avelocity of 20 m/s and frequency nThe distancebetween two consecutive nodes is [1995]
20. The wave described by y =0.25 sin (10Ï€x -“ 2Ï€t) - where x and y are in meters and t in seconds - is a wavetravelling along the: [2008]
21. The length of the wire between two ends of asonometer is 100 cmWhat should be the positions oftwo bridges below the wire so that the three segments ofthe wire have their fundamental frequencies in the ratioof 1: 3: 5? [NEETKar2013]
22. The temperature at which the speed of soundbecomes double as was at 27°C is [1993]
23. Velocity of sound waves in air is 330 m/sFor aparticular sound wave in air - a path difference of 40 cmis equivalent to phase difference of 1.6 πThe frequencyof this wave is [1990]
24. A tuning fork of frequency 512 Hz makes 4 beatsper second with the vibrating string of a pianoThe beatfrequency decreases to 2 beats per sec when the tensionin the piano string is slightly increasedThe frequency ofthe piano string before increasing the tension was[2010]
25. A standing wave is represented by y = Asin (100t)cos (0.01x) - where y and A are in millimetre - t in secondsand x is in metreVelocity of wave is [1994]

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