41. Decibel is the unit of
42. The speed of sound depends on which property of the medium.
43. What are transverse waves?
44. Which one of the following statements about sound is not correct?
45. The frequency of a wave travelling at a speed of 500ms-1 is 20Hz. It's time period is-
46. At what stage should the medium required for the transmission of sound-
47. A spring can be used to determine the mass m of an object in two ways : I by measuring the extension in the spring due to the object and II by measuring the oscillation period for the given mass.
Which of these methods can be used in a space-station orbiting the earth?
Which of these methods can be used in a space-station orbiting the earth?
48. The technique used to absorb noise by using soft and porous surface is called:
49. A sound wave travels at a speed of 340 m/s. If its wavelength is 2 cm, what is the frequency of the wave?
50. What is the decibel level of sound produced by two persons in conversation?
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