81. Why can not the sound is heard on the Moon?
82. Sound moves with higher velocity if
83. A biotechnique in which ultrasonic sound is used
84. At 20°C, the speed of sound in water approximately
85. The velocity of a wave is frequency (f) and wavelength (λ) ?
86. Which of the following has the longest wavelength?
87. Which of the following are the characteristics of electromagnetic waves?
1. They are elastic waves.
2. They can also move in vacuum.
3. They have electric and magnetic components which are mutually perpendicular.
4. They move with a speed equal to 3 lakh meters per second.
Select the correct answer:
1. They are elastic waves.
2. They can also move in vacuum.
3. They have electric and magnetic components which are mutually perpendicular.
4. They move with a speed equal to 3 lakh meters per second.
Select the correct answer:
88. A source of frequency 500 Hz emits waves of 0.4 m wavelength. How long time will it take by the wave to travel 600 meters?
89. What is the repeated reflection of sound from the walls of a large hall, which results in the persistance of sound?
90. Which term is not associated with sound wave?
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