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question_answer1) Is an oscillation a wave? Give reason.
question_answer2) A wave transmits momentum. Can it transfer angular momentum?
question_answer3) Frequency is the most fundamental property of a wave. Why?
question_answer4) Which of the following is not a wave characteristic : Reflection, refraction, interference, diffraction, polarisation, rectilinear propagation?
question_answer5) How is energy transmitted in wave motion?
question_answer6) Name two important properties of a material medium responsible for the propagation of waves through it.
question_answer7) What is the source of electromagnetic waves?
question_answer8) Why are the longitudinal waves also called pressure waves?
question_answer9) What is a non-dispersive medium? Give an example.
question_answer10) Can transverse waves be produced in air?
question_answer11) Do displacement, particle velocity and pressure variation in a longitudinal wave vary with the same phase?
question_answer12) How can we distinguish experimentally between longitudinal and transverse waves?
question_answer13) What is the direction of oscillations of the particle of the medium through which (i) a transverse and (ii) a longitudinal wave is propagating?
question_answer14) What is the difference between wave velocity and particle velocity?
question_answer15) We always see lightning before we hear thundering. Why?
question_answer16) What does cause the rolling sound of thunder?
question_answer17) Two astronauts on the surface of the moon cannot talk to each other. Why?
question_answer18) Why explosions on other planets cannot be heard on the earth?
question_answer19) When a stone is thrown on the surface of water, a wave travels out. From where does the energy come?
question_answer20) Why does sound travel faster in solids than in gases?
question_answer21) How is it possible to detect the approaching of a distant train by placing the ear very close to the railway line?
question_answer22) If a person places his ear to one end of a long iron pipeline, he can distinctly hear two sounds when a workman hammers the other end of the pipeline. How?
question_answer23) Ocean waves hitting a beach are always found to be nearly normal to the shore. Why?
question_answer24) In which medium, do the sound waves travel faster, solids, liquids or gases? Give reason.
question_answer25) Sound travels faster on a rainy day than on a dry day. Why?
question_answer26) If the pressure of a gas at constant temperature is increased four times, how the velocity of sound in the gas will be affected?
question_answer27) Explain why sound travels faster in warm air than cool air?
question_answer28) What is the nature of thermal changes in air when sound propagates through air?
question_answer29) What characteristics of a medium determine the speed of sound waves through it?
question_answer30) If we set our watch by the sound of a distant siren, will it go slow or fast?
question_answer31) What will be the velocity of sound in a perfectly rigid rod? Give reason.
question_answer32) Sound is simultaneously produced at the ends of the two strings of the same length, one of rubber and the other of steel. In which string will the sound reach the other end earlier and why?
question_answer33) The speed of sound does not depend upon its frequency. Give an example in support of this statement.
question_answer34) The speed of sound in moist air is greater than that in dry air, why? Will the speed of sound in moist hydrogen be greater than that in dry hydrogen?
question_answer35) The velocity of sound in a tube containing air at \[{{27}^{\circ }}C\] and a pressure \[\mathbf{76}\text{ }\mathbf{cm}\] of mercury is\[\text{330 m}{{\text{s}}^{\text{-1}}}\]. What will be the velocity of sound when pressure is increased to \[\mathbf{100}\text{ }\mathbf{cm}\] of mercury and the temperature is kept constant?
question_answer36) The shape of a pulse gets distorted as it passes through a dispersive medium. Why?
question_answer37) If an explosion takes place at the bottom of a lake, will the shock waves in water be longitudinal or transverse?
question_answer38) Does the sound of a bomb explosion travel faster than the sound produced by a humming bee?
question_answer39) If a balloon is filled with \[\text{C}{{\text{O}}_{2}}\] gas, then how will it behave for sound as a lens? What happens if \[\text{C}{{\text{O}}_{2}}\] gas is replaced \[{{H}_{2}}\] gas?
question_answer40) Sound can be heard over long distances on a rainy day. Why?
question_answer41) Why sound can be heard more distinct at a greater distance over water surface?
question_answer42) What is a periodic wave function?
question_answer43) What is a harmonic wave function?
question_answer44) A heavy uniform rope is held vertical and is tensioned by clamping it to a rigid support at the lower end. A wave of certain frequency is set up at the lower end. Will the wave travel up the rope at the same speed?
question_answer45) Sometimes, in a stringed instrument, a thick wire is wrapped by a thin wire. Why?
question_answer46) Why are stationary waves called so?
question_answer47) When are stationary waves produced?
question_answer48) Under what condition does a sudden phase reversal of waves on reflection take place?
question_answer49) A light wave is reflected from a mirror and the incident and the reflected waves superpose to form stationary, waves. Explain why nodes and antinodes are not observed, similar to that found in case of sound waves.
question_answer50) What is difference between a tone and a note?
question_answer51) Why is the note produced by a open organ pipe sweeter than that produced by the closed organ pipe?
question_answer52) Why are there so many holes in a flute?
question_answer53) Why does the pitch of a note produced by a wooden open end pipe becomes sharper when the temperature rises?
question_answer54) When we start filling an empty bucket with water, the pitch of sound produced goes on changing. Why?
question_answer55) A vessel is placed below a water-tap. We can estimate the height of water level reached in the vessel from a distance simply by listening the sound. How?
question_answer56) If oil of density higher than the density of water is used in a resonance tube, how will the frequency change?
question_answer57) A vibrating string is heated to a higher temperature." What happens to the pitch of the note produced by it?
question_answer58) Why are strings of different thicknesses and materials are used in a sitar or a violin?
question_answer59) A tuning fork is in resonance with a closed pipe. But the same tuning fork cannot be in resonance with an open pipe of same length. Why?
question_answer60) Why does the pitch of a note produced by a wooden open end organ pipe become shaper when the temperature increases?
question_answer61) Two organ pipes of same length open at both ends produce sound of different frequencies if their radii are different. Why?
question_answer62) How does the frequency of a tunning fork change, when the temperature is increased?
question_answer63) How does the frequency of a vibrating wire change, when the attached load is immersed in water?
question_answer64) What points of the stretched string between the fixed points must be plucked and touched to excite its second harmonic?
question_answer65) What is the function of the wooden box in the sonometer? Does it increase or decrease the duration of emission?
question_answer66) Why is a sonometer box provided with holes?
question_answer67) The beats are not heard, if the difference in frequencies of the two sounding notes is more than 10. Why?
question_answer68) Why do we not hear beats due to sound waves produced by the violins in the violin-section of an orchestra?
question_answer69) As in sound, can beats be observed by two light-sources?
question_answer70) Is it necessary for beat production that the two waves must have exactly equal amplitudes?
question_answer71) If two sound waves of frequencies \[\mathbf{500}\text{ }\mathbf{Hz}\] and \[\mathbf{550}\text{ }\mathbf{Hz}\] superpose, will they produce beats? Would you hear the beats?
question_answer72) Can we hear beats when sounds from two different sources are heard together?
question_answer73) Does Doppler's effect apply to only sound waves?
question_answer74) What physical change occurs when a source of sound moves and the listener is stationary?
question_answer75) What physical change occurs when the source of sound is stationary but the listener moves?
question_answer76) Will there be Doppler effect, when the direction of motion of the source or observer is perpendicular to the direction of propagation of sound?
question_answer77) A person riding on a merry-go-round emits a sound wave of a certain frequency. Will the person at the centre observe Doppler effect?
question_answer78) Will there be any Doppler effect, if both the sound and the listener are moving with the same velocity and in the same direction?
question_answer79) What is an echo? What should be the minimum distance between the source of sound and the reflector for hearing a distinct echo?
question_answer80) Explain why we cannot hear an echo in a small room?
question_answer81) What do you mean by reverberation? What is reverberation time?
question_answer82) What is the difference between an echo and a reverberation?
question_answer83) The reverberation time is larger for an empty hall than in a crowded hall. Why?
question_answer84) Thick and long curtains are preferred in a big hall. Why?
question_answer85) An organ pipe emits a fundamental note of frequency\[\mathbf{128}\text{ }\mathbf{Hz}\]. On blowing into it more strongly it produces the first overtone of frequency\[\mathbf{384}\text{ }\mathbf{Hz}\]. What is the type of pipe - closed or open?
question_answer86) What are infrasonics and ultrasonics?
question_answer87) How do we identify our friend from his voice while sitting in a dark room?
question_answer88) What determines the quality of sound?
question_answer89) A violin note and a sitar note may have the same frequency and yet we can distinguish between the two notes. Explain, why it is so.
question_answer90) What do you understand by the fidelity of an instrument?
question_answer91) What is the factor on which pitch of a sound depends?
question_answer92) Where will a man hear a louder sound - at the node or at the antinode in case of a stationary wave?
question_answer93) Given below are some examples of wave motion. State in each case, if the wave motion is transverse, longitudinal or a combination of both : (i) Motion of a kink in a long coil spring produced by displacing one end of the spring sideways. (ii) Waves produced in a cylinder containing a liquid by moving its piston back and forth. (iii) Waves produced by a motor boat sailing in water. (iv) Light waves travelling from the sun to the earth. (v) Ultrasonic waves in air produced by a vibrating quartz crystal.
question_answer94) Why is the sound produced in air not heard by a person deep inside the water?
question_answer95) In summer, the sound of a siren is heard louder in the night than in the day to a person on the earth. Why?
question_answer96) If two waves of same frequency but of different amplitudes travelling in opposite directions through a medium superpose upon each other, will they form stationary wave? Is energy transferred? Are there any nodes?
question_answer97) What are overtones and harmonics? The presence of which makes a sound musical? Or Distinguish between harmonics and overtones.
question_answer98) All harmonics are overtones but all overtones are not harmonics. How?
question_answer99) The fundamental frequency of a source of sound is \[\mathbf{200}\text{ }\mathbf{Hz}\] and the Source produces all the harmonics. State, with reasons, with which of the following frequencies this source will resonate: 150, 200, 300 and 600 Hz?
question_answer100) An organ pipe is in resonance with a tuning fork. What change will have to be done in the length L to maintain the resonance, if (i) the temperature increases, (ii) hydrogen is filled in place of air and (iii) pressure becomes higher?
question_answer101) Fig. shows two vibrating modes of an air column. Find the ratio of frequencies of the two modes.
question_answer102) Two progressive sound waves each of frequency \[\mathbf{170}\text{ }\mathbf{Hz}\] and travelling in opposite directions in air superpose to produce stationary waves. The speed of sound in air is\[\mathbf{340 m}{{\mathbf{s}}^{\mathbf{-1}}}\]. What is the separation between (i) two successive nodes, (ii) two successive antinodes and (iii) a node and its nearest antinode?
question_answer103) A sonometer wire resonates with a tuning fork. If the length of the wire between the bridges is made twice even then it can resonate with the same tuning fork. How?
question_answer104) Why does a tuning fork have two prongs? Would the tuning fork be of any use, if one of the prongs is cut off?
question_answer105) Why is a tuning fork used as a standard oscillator? On what factors does the pitch of a tuning fork depend?
question_answer106) A sitar wire and a tabla, when sounded together, produce 5 beats per second. What can be concluded from this? If the tabla membrane is tightened, will the beat rate increase or decrease?
question_answer107) Doppler effect is asymmetric in sound whereas in case of light it is symmetric. Explain.
question_answer108) Distinguish between transverse and longitudinal waves.
question_answer109) What is red shift? What does it indicate?
question_answer110) An incident wave is represented by\[y(x,t)=20\sin (2x-4t).\]Write the expression for reflected wave: (i) from a rigid boundary. (ii) from an open boundary.
question_answer111) State the principle of superposition of waves. Distinguish between conditions for the production of stationary waves and beats.
question_answer112) Differentiate between Stationary waves and Progressive waves.
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