61. The velocity of sound in moist air is more than in dry air because the moist air has
62. Which one among the following doesn't have any effect on velocity of sound ?
63. Velocity of sound in air does not change with the change of
64. The propagation of sound waves in a gas involves
65. When two similar sources vibrate with slightly different frequencies, a regular rise and fall occurs in the loudness of tone. This phenomenon is known as
66. Propagation of sound can be visualised as propagation of ________ variations in the medium
67. Permissible noise level at Residential area during night time is :
68. Calculate the time period (in seconds) of a sound wave of wavelength 4m traveling with a speed of 500m/s
69. Which waves cannot be transmitted through vacuum?
70. Submerged objects can be located using
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