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. A source of sound gives 5 beats per second - whensounded with another source of frequency 100/secThesecond harmonic of the source - together with a source offrequency 205/sec gives 5 beats per secondWhat is thefrequency of the source? [1995]
2. The equation of a sound wave is given as: y =0.0015 sin (62.4 x + 316 t)The wavelength of this waveis [1996]
3. The velocity of sound in any gas depends upon[1988]
4. Two sound sources emitting sound each ofwavelength λ are fixed at a given distance apartAlistener moves with a velocity u along the line joiningthe two sourcesThe number of beats heard by him persecond is [2000]
5. If the amplitude of sound is doubled and thefrequency is reduced to one fourth - the intensity ofsound at the same point will be [1989]
6. 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]
7. What is the effect of humidity on sound waveswhen humidity increases? [1996]
8. A transverse wave is represented by y = A sin (ωt-“kx)For what value of the wavelength is the wavevelocity equal to the maximum particle velocity? [2010]
9. A wave in a string has an amplitude of 2 cmThewave travels in the + ve direction of x axis with a speedof 128 m/sec and it is noted that 5 complete waves fit in4 m length of the stringThe equation describing thewave is [2009]
10. 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]
11. Sound waves travel at 350 m/s through a warm airand at 3500 m/s through brassThe wavelength of a 700Hz acoustic wave as it enters brass from warm air[2011]
12. 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]
13. where x is in metres and t is in secondsThe speed of thewave is [2006]
14. 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]
15. 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]
16. The phase difference between two waves - represented byy1 = 10-“6 sin{100 t + (x/50) +0.5} my2 = 10-“6 cos{100 t + (x/50)} mwhere x is expressed in metres and t is expressed inseconds - is approximately [2004]
17. 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]
18. 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]
19. If we study the vibration of a pipe open at bothends - then which of the following statements is not true?[NEET2013]
20. Two waves of lengths 50 cm and 51 cm produce 12beats per secThe velocity of sound is [1999]
21. 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]
22. Two waves are said to be coherent - if they have[1995]
23. A closed organ pipe (closed at one end) is excited tosupport the third overtoneIt is found that air in the pipehas [1991]
24. A whistle of frequency 385 Hz rotates in ahorizontal circle of radius 50 cm at an angular speed of20 radians s -“1The lowest frequency heard by a listenera long distance away at rest with respect to the centre ofthe circle - given velocity of sound equal to 340 ms -“1 - is[2002]
25. The driver of a car travelling with speed 30 m/sectowards a hill sounds a horn of frequency 600 HzIf thevelocity of sound in air is 330 m/s - the frequency ofreflected sound as heard by driver is [2009]

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