By Kumar Manoj

ISBN-10: 8182472261

ISBN-13: 9788182472266

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3xlO-3 per sec. [Ans. M has amplitude 1 cm. Its velocity at the mean position is 10 cm its displacement is 10 cm. [Ans. M of amplitude 10-2 m . Its velocity while passes through equilibrium is 10m/sec. Find its frequency. 4. [Ans. M of amplitude 1 cm and time period 4 sec. 5. [Ans. M. in a line 4 cm long. Its velocity when passes through the centre of the line is 12 cm/sec. Find the time period. 7r [Ans. " Upto 19th century there was no consideration of sound effects in the halls, auditorium etc.

Ans. 3 Sec. ] O(jJU. \55\ 3. A cinema hall (). 5 sec. What would be the total absorption in the hall ? [Ans. Las = 80 units] 4. Find the reverberation time for (a) the empty halI, (b) with 60 Persons with date given below, V = 2,900 m 3 Surface Area Absorption Coefficient 1. 030mu 2. 06omu 3. 04o{j)u 4. 06omu 5. Audience 6. Oo{j)u [Ans. TJ 5. 9. 04 2. 03 3. 06 4. Wooden Doors 400 m 2 100 no. 00 omu / seat 100 no. 00 omu I seat 6. Seats Cone. 8. 36 l. Plastered Ceiling 5. Seats Cushioned 7. sec.

T. 4 Sec. ] 2. An auditorium has a volume of 9,000 m 3 and total surface absorption is 160 Find the reverberation time. [Ans. 3 Sec. ] O(jJU. \55\ 3. A cinema hall (). 5 sec. What would be the total absorption in the hall ? [Ans. Las = 80 units] 4. Find the reverberation time for (a) the empty halI, (b) with 60 Persons with date given below, V = 2,900 m 3 Surface Area Absorption Coefficient 1. 030mu 2. 06omu 3. 04o{j)u 4. 06omu 5. Audience 6. Oo{j)u [Ans. TJ 5. 9. 04 2. 03 3. 06 4. Wooden Doors 400 m 2 100 no.

### A Comprehensive Text Book of Applied Physics by Kumar Manoj

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