61. In which medium the speed of sound is maximum at a temperature of around 20°C?
62. Which one of the following types of radiation has the shortest wavelength?
63. If the amplitude or oscillation of a simple pendulum is very small, then its time period of oscillation
1. depends on the length of the pendulum, L.
2. depends on the acceleration due to gravity, g.
3. depends upon the mass of the bob of the pendulum, m.
4. does not depend upon the amplitude of the pendulum, A.
Select the correct answer:
1. depends on the length of the pendulum, L.
2. depends on the acceleration due to gravity, g.
3. depends upon the mass of the bob of the pendulum, m.
4. does not depend upon the amplitude of the pendulum, A.
Select the correct answer:
64. Which one of the following statements is not correct?
65. Bats can sense obstacles because they produce
66. A boy clapped near a rock and after 3 seconds he heard an echo. If the speed of sound is 346 meters sec-1, then what distance is from the boy and the rock?
67. Arrange the following medium - solids, liquids and gases, in descending order of speed of sound through them.
68. Sound waves with frequency below the audible range are called-
69. Sound of frequencies below 20 Hz are called . . . . . . . .
70. Stationary waves are so called because in them
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