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Iii) A large number of audience also contribute to decrease the reverberation time. 7 square feet of an open window. (iv) By using heavy curtains on the walls of the room or in a hall, it also controls the reverberation time. (v) Maps and pictures hanging on the walls of hall. (vi) The false ceiling of a suitable sound absorbing meterial also helps to control the reverberation time. (vii) Setting upholding seats in the halls also control the reverberation time as these seats work as a good absorbing materials.

I = density of the material. from this equation we can say that the frequency of ultrasonics produced by this method will depend upon the length of rod, Young modulus of elasticity and density ofthe materials. To increase the frequency, the length of the rod should be decreased. But it is not possible to decrease the length of the rod within a certain limit. So a very high frequency ultrasonic cannot be produced by this method. ). (II) PIEZO-ELECTRIC OSCILATOR :The ultrasonic wave produed by Piezo-electric oscillator is based on the piezoelectric effect.

2. Define longitudnal and transverse waves. \32\ Applied Physics-II 3. Define compressions and rarefactions. 4. Define crest and trough. 5. Define wavelength. 6. Define time period. 7. Define frequency. 8. What is amplitude? 9. What is wave velocity? 10. What is the relation between period and frequency? 11. 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.

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