# A comprehensive text book of applied physics by Manoj Kumar

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B) 3x 10 8 m1sec. (c) 3 xl 0-8 m/sec. (d) -332 m/sec. (b) (d) 3 x 10-8 m/sec. -332 m/sec. Velocity of a sound wave is (a) 3x 108 m/sec. (c) 332 m/sec. Elastic waves in a solids are (a) Transverse (b) (c) Neither transverse nor longitudnal None of these. (d) Longitudnal 9. The velocity of sound in air is independent on the change in (a) Pressure (b) Density (c) Temperature (d) Humidity 10. The speed of sound will be greatest in (a) Air (b) (c) Water (d) 11. Vaccum Metal A particle is moving in a circle at, a uniform speed, its motion is (a) Periodic and simple harmonic (b) Periodic but not simple harmonic \31\ (c) (d) A periodic None of these.

What do you mean by Musical Sound and Noise? Explain the charactersitcs of Musical Sound. 2. What is reverberation, reverberation time? How it can be controlled? (V IMP) 3. What do you mean by accousting of Building. On which factors it can be depends. (V IMP) 4. Sound in an empty halls seems to be louder than when it is full of audience. Explain. Why? 5. What is Ultrasonic? Explain magnetastriction method for producing ultrasonic. (V IMP) 6. What is Ultrasonic? Explain Piezpelectric method for producing ultrasonic.

For getting good sound effects the reverberation time should be minimum. The reverberation time depends upon the nature of the reflecting material, size of the room or hall and area of reflecting surfaces. Let us assume that we produce a sound, In the begining the intensity of the sound will be low and it increasse when it is reflected by walls, ceiling, floor, window of the hall or room and a stage is reached where the intensity of the sound is maximum. Now when we stop producing the sound, even after that point the intensity of sound does not fall suddenly to zero, but falls exponentially along the path CB as shown in fig.

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