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 vehicle - with a horn of frequency n is movingwith a velocity of 30 m/s in a direction perpendicular tothe straight line joining the observer and the vehicle.The observer perceives the sound to have a frequency n+ n1Then (if the sound velocity in air is 300 m/s)[1998]
2. 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]
3. where x is in metres and t is in secondsThe speed of thewave is [2006]
4. 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]
5. A hospital uses an ultrasonic scanner to locatetumours in a tissueThe operating frequency of thescanner is 4.2 MHzThe speed of sound in a tissue is 1.7km/sThe wavelength of sound in tissue is close to[1995]
6. 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]
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. Two waves are said to be coherent - if they have[1995]
9. If the amplitude of sound is doubled and thefrequency is reduced to one fourth - the intensity ofsound at the same point will be [1989]
10. 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]
11. 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]
12. With the propagation of a longitudinal wave througha material medium - the quantities transmitted in thepropagation direction are [1992]
13. 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]
14. Two vibrating tuning forks produce progressivewaves given by y1 = 4 sin 500 πt and y2 = 2 sin 506 πt.Number of beats produced per minute is [2005]
15. 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]
16. 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]
17. What is the effect of humidity on sound waveswhen humidity increases? [1996]
18. 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]
19. If we study the vibration of a pipe open at bothends - then which of the following statements is not true?[NEET2013]
20. 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]
21. 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]
22. 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]
23. Two waves of the same frequency and intensitysuperimpose each other in opposite phasesAfter thesuperposition - the intensity and frequency of waves will[1996]
24. 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]
25. Each of the two strings of length 51.6 cm and 49.1cm are tensioned separately by 20 N forceMass per unitlength of both the strings is same and equal to 1 g/m.When both the strings vibrate simultaneously thenumber of beats is [2009]

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