41. Speed of sound in air is unaffected by change in
42. Bats can fly during dark nights and also prey. This is because
43. What is the intensity level of very low audio sound?
44. Which of the following determines the loudness or softness of a sound?
45. If the frequency of a wave increases, what will be the effect on its wave length?
46. Sound produced by a radio increases by:
47. Which type of waves is used to penetrate hard object at hospital and airport?
48. As an empty vessel is filled with water its frequency
49. If the time period of a sound wave is 0.04s, then what is its frequency?
50. Particles oscillate up and down perpendicular to the direction of propagation of the wave, what kind of waves are discussed here-
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