By Manoj Kumar

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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.

What is periodic and oscillatory motion? 12. M. 13. What is resonance? 14. What is a free vibration? SHORT TYPE QUESTIONS 1. Explain the Generation of wave motion by particles. 2. Differentiate between longitudnal and transverse waves. 3. Differentiate between light wave and sound wave. 4. Explain the proagation of a transverse waves. 5. M. Derive an expression for displacement. 6. M. and also derive an expression for velocity ofa particle. 7. Derive an expression for acceleration for a particle.

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. ,(2) INFRASONICS:- The sound of frequency less than 20 Hz which is not heard by the normal human ear is called infrasonics.