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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. 12. M. in one time period is (a) r (b) 2r (c) 4r (d) Zero. 13. M. in one time period is (a) r (b) 2r (c) 4r (d) Zero 14.

In the 19th century a scientist named C. Sabine faced similar problems and suggested ways to get better sound quality and effects in the halls, cinema halls, auditorium. SOUND ABSORPTION AND SOUND REFLECTION :When a sound is produced in a hall or auditorium, it spreads out in all the directions and strikes the walls, ceilling, floor, window etc. of the hall. Sound incident on any surface ofa material splits into three parts. One part is reflected. 1) Material Transmitted Sound from the surface with a reflection angle equal to the angle of incidence.

2. 3. 4. 5. 6. 2 owu/head Find out the reverberation time. SOLUTION :Given Volume, V = 3500 m 3 No. of audience accupying wooden seats = audience - wooden seats. = 370 - 300 = 70 No. of empty wooden seats = 300 - 70 = 230 absorption due to each material and the audience is given by. 27 sec. Ans. \44\ Applied Physics-II ULTRASONICS :; '(I) AUDIBLE SOUND - The sound with a frequency between 20 Hz to 20000 Hz (20 Hz - 20 KHz) which can be heared by a normal human being. It is called audible sound.

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