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 temperature at which the speed of soundbecomes double as was at 27°C is [1993]
2. What is the effect of humidity on sound waveswhen humidity increases? [1996]
3. Which of the following equations represent awave? [1994]
4. 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]
5. 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]
6. Two sound waves having a phase difference of 60°have path difference of [1996]
7. 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]
8. 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]
9. For production of beats the two sources must have[1992]
10. Two waves of lengths 50 cm and 51 cm produce 12beats per secThe velocity of sound is [1999]
11. 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]
12. 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]
13. Two sources P and Q produce notes of frequency660 Hz eachA listener moves from P to Q with a speedof 1 ms-“1If the speed of sound is 330 m/s - then thenumber of beats heard by the listener per second will be[NEETKar2013]
14. Which one of the following statements is true?[2006]
15. Two trains move towards each other with the samespeedThe speed of sound is 340 m/sIf the height of thetone of the whistle of one of them heard on the otherchanges 9/8 times - then the speed of each train shouldbe [1991]
16. Two identical piano wires kept under the sametension T have a fundamental frequency of 600 HzThefractional increase in the tension of one of the wireswhich will lead to occurrence of 6 beats/s when both thewires oscillate together would be [2011M]
17. 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]
18. The velocity of sound in any gas depends upon[1988]
19. 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]
20. 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]
21. 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]
22. 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]
23. 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]
24. 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]
25. 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]

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