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Distance travelled by sound in air, d =V xt=330x2=660m (b) In water. V= 1650 m s-1, d 660 m = .'. Time taken by sound to travel d in water will be (a)Given,inairV = 330ms-1,/= 2s From relation V = d 66Om i= il=y 1650 m s-' d t the distance =0.4s. EXERCISE 8 (A) , Sftat causes sound ? Sound is caused due to vibrations of a .""What is sound ? How is it produced ? Complete the following sentence : Sound is produced by u ............. body. ., , What do you mean by the term frequency of body. . a wave ? state its S.I. unit. How is the frequency of a wave related to its time period ? Frequency = l/time period Define the term wave velocity. Write its S.I. unit. 0.,,1,;t#11"i irTJ#ii[:"frHJ#"-Tiii";*Jffi;"1 a displacement-distance Describe a simpre experiment *n,"n that the sound produced by a tuning fo.1. to vibrations oflts arms. i, ;;; J graph of a wave ?::and mark on it, the amplitude of wave by the letter a and rvavelength of wave by the letter i,. How the wave velocity V, frequency and diasram/ rui".iui _are *?I:l""gt I' of a wave related ? Derive the ' medium is necessary for the propagation ,;il. relationship There is no atmosphere on moon. cu, "f yo, n.* . State. two properties of medium on which the each other on the moon's surface ? No. .--l" speed of sound in it depends. . State three characteristics of the mediu* ,rqrir.a (i) Elasticity (ii) density. for propagation of sound ? Explain with an example, the propagation of ' Arrange the speed of sound in gases V. , solids V, and liquids V1 in an ascending order. sound in a medium. Vr < Vyl'V, Choose the correct word/words to complete the State the speed of (i) light and (ii) sound in air ? following sentence ' (i) Speed of light = 3 x 108 m s-1 When sound travels in a medium ...... (the (ii) Speed of sound = 330 m s-t. particles of the medium, the source, the Compare approximately the speed of sound in disturbance, the medium) travels in form of a wave. ' ' the disturbance air, water and steel. I : 4 : 15 Answer the following -.,-_Name the t**o kinds of waves in form of which sound travels in a medium. (i) can sound travel in vacuum ? i' What is a longitudinal wave ? In which medium: (ii) How does the speed of sound differ in different solid, liquid or gas, can it be produced r media ? (i) No (ii) Speed of sound is maximum in What is a transverse wave ? In which medium: solid, liquid or gas, can it be produced ? solids, less in liquids and least in gases. Flash Explain of lightning reaches us earlier than the meaning . of the terms compression and rarefaction in relation to a longitudnal wave. sound of thunder. Explain the reason. Light travels much faster than sound Explain the terms crest and trough in relation to a transverse wave. If you place your ear close to an iron railing which is tapped some distance away, you hear Describe an experiment to show that in wave the^sound twice. Explain why ? motion, only energy is transferred, but particles Sound travels in iron faster than in air, so first of medium do not leave their position. the sound through iron rail is heard and then ,' Define the tenn amplitude of a wave. Write its the sound through air is heard. S.I. unit. Describe in brief, with the aid of a labelled an experiment to demonstrate that a : rx 175 ..i:ri::r,

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