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Exercisesreflectedis the depth ofSound docroyedNa hetlichtinger s o ng it whatthe distance of the lighting- 1550 mand - 45The cod ethan the velocity ofand in watThe incidence of indonly lifeshows that the velocity of sound isless than the velocity of lightTo discover our ship or objectsdeep inside the soTechnology is usedThe velocity of sound in 340misAns: 1360 m)C. S ising bocn twoperille walls. The wall closest tohim is at a distance of 660 m. Thesbouis, he hears the first echo ofler4-5 and another after unther 2seconds1. What is the velocity of sound in100 mWhatExplain giving scientific resonThe roof of a movie theatre andconference hall is curvedb. The intensity of reverberation ishigher in a closed and empty house.We cannot hear the echo producedin a classroom.Answer the following questions inyour own words.What is an echo? What factors areimportant to get a distinct echo?b. Study the construction of theGolghumat at Vijapur and discussthe reasons for the multiple echoesproduced there.c. What should be the dimensionsand the shape of classrooms sothat no echo can be producedthere?4. Where and why are sound absorbingmaterials used?5. Solve the following examples.The speed of sound in air at O'C is332 m/s. If it increases at the rateof 0.6 ms per degree, what will be2. What is the distance between thetwo walls?(Anse 330 mis: 1650 m)d. Hydrogen gas is filled in twoidentical bottles, A and B at thesome temperature. The mass ofhydrogen in the two bottles is 12gm and 48 gm respectively. Inwhich bottle will sound travelfaster? How may times as fast asthe other?(Ans: In A: Twice)e. Helium gas is filled in two identicalbottles A and B. The mass of thegas in the two bottles is 10 qm and40 gm respectively. If the speed ofsound is the same in both bottles,what conclusions will you draw?(Ans: Temperature of Bis 4times the temperature of A.)Project:Collect information about themusical Instrument calledJalrarong and find out how thedifferent notes are produced in it280ord bycmythe temperature when the velocityhas increased to 344 m/s?(Ans: 200 °C) |
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Answer» 9th class ki book hai bhai question 1 a)sound does not travel through answer is vacuumb) the velocity of sound in steel is greater than the velocity of sound in waterc)the incidence of lightning in daily life shows that the velocity of sound is less than the velocity of lightd) to discover a circle shaped objects deep inside the sea sonar technology is usedquestion 2a): question 2a): 1. in a movie theatre or a conference hall sound is produced at one place2. this sound waves are usually reflected by the walls and ceilings3.acrostics of a movie theatre or conference hall should be such that the sound waves should reach everyone in the audience without any sound loss eco production reverberations after reflection4.to make this possible roop of movie theatre and conference hall sarkari so that sound elected from the sun reaches all the parts of the theatre all her |
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