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Sudipta Bera
Vidyasagar University (VU), Midnapore
M.Sc Physics
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SOUND ATTEMPT ALL THE QUESTIONS FM-50 TIME-1.20hr 1. What do you mean by longitudinal and transverse wave? 2. Give two differences between light and sound wave. 3. What do you mean by echo? What is the condition necessary for an echo to be heard distinctly? 4. What is meant by sound ranging? Give one use of sound ranging. 5. A parson standing between the two vertical cliffs produces a sound. Two successive echoes are hard at 4s and 6s. Calculate the distance between the cliffs.(speed of sound in air=320m/s) 6. Explain how the speed of sound can be determined by the method of echo. 7. What do you mean by natural frequency of vibration? On what it depends? 8. How the frequency of vibration of a string varies with length, radius and tension? 9. Sometimes when a vehicle is driven at a particular speed, a rattling sound is heard. Explain briefly, why this happens and give the name of the phenomenon taking place. Suggest one way by which the rattling sound could be stopped. 10. Draw sketches showing the displacement of a body with time for free and damped vibration. 11. State the condition for the occurrence of resonance. 12. Why a large sound is produce at resonance? 13. When a troop crosses a bridge, the soldiers are asked to break steps. Explain reason. 14. A blade, fixed at one end, made to vibrate by pressing its other end and releasing it. State two ways by which frequency of the blade can be lowered. 15. Why the string instruments are provide a hollow box? 16. Give two differences between music and noise. 17. Define intensity of sound wave. State the unit in which it is measured. 18. What do you understand by the term quality of a musical note? Illustrate your answer with diagram. 19. How is it possible to detect a person by his voice? 20. Which diagram shows a) a note from musical instrument b) a soft note c) a bass note 21. 22. 23. 24. 25. Explain the subjective nature of pitch and objective nature of frequency. Give three factors on which loudness depends. In what respect does the wave pattern of a noise differ from music. Define bel. And give relation between bel and db. Explain resonance in TV recever.

 

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