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. The speed of a wave in a medium is 960 m/sIf3600 waves are passing through a point in the mediumin 1 min- then the wavelength of the wave is [1997]
2. 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]
3. What is the effect of humidity on sound waveswhen humidity increases? [1996]
4. If the amplitude of sound is doubled and thefrequency is reduced to one fourth - the intensity ofsound at the same point will be [1989]
5. Two waves of the same frequency and intensitysuperimpose each other in opposite phasesAfter thesuperposition - the intensity and frequency of waves will[1996]
6. 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]
7. A string of 7 m length has a mass of0.035 kgIftension in the string is 60.5 N - then speed of a wave onthe string is [2001]
8. 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]
9. The equation of a sound wave is given as: y =0.0015 sin (62.4 x + 316 t)The wavelength of this waveis [1996]
10. A source of unknown frequency gives 4 beats/s - when sounded with a source of known frequency 250HzThe second harmonic of the source of unknownfrequency gives five beats per second - when soundedwith a source of frequency 513 HzThe unknownfrequency is [NEET2013]
11. 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]
12. 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]
13. 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]
14. Two sound waves having a phase difference of 60°have path difference of [1996]
15. With the propagation of a longitudinal wave througha material medium - the quantities transmitted in thepropagation direction are [1992]
16. For production of beats the two sources must have[1992]
17. 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]
18. 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]
19. An organ pipe P1 closed at one end vibrating in itsfirst overtone and another pipe P 2 - open at both endsvibrating in its third overtone are in resonance with agiven tuning forkThe ratio of lengths of P 1 and P2respectively are given by1997]
20. 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]
21. Two waves are represented by the equations y 1 = asin (ωt + kx +0.57) m and y 2 = a cos (ωt + kx) m - where xis in meter and t in secThe phase difference betweenthem is [2011]
22. 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]
23. Which one of the following statements is true?[2006]
24. A wave of frequency 100 Hz is sent along a stringtowards a fixed endWhen this wave travels back afterreflection - a node is formed at a distance of 10 cm fromthe fixed end of the stringThe speeds of incident (andreflected) waves are [1994]
25. 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]

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