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प्रश्न
Can we produce sound in vacuum?
उत्तर
No, sound cannot be produced in vacuum. It needs a material medium
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संबंधित प्रश्न
How is sound produced ?
The sound of an explosion on the surface of a lake is heard by a boat man 100 m away and by a diver 100 m below the point of explosion.
(i) Who would hear the sound first: boatman or diver?
(ii) Give a reason for your answer in part (i).
(iii) If sound takes time t to reach the boatman, how much time approximately does it take to reach the diver?
The speed of light in air is :
How is the sound produced?
A thin metal plate is placed against the teeth of cog wheel. Cog wheel is rotated at a speed of 120 rotations per minute and has 160 teeth. Calculate:
- frequency of node produced.
- speed of sound, if wavelength is 1.05 m.
- what will be the effect when the speed of cog wheel is doubled?
A sound wave of wavelength 1/3 m has a frequency 996 Hz. Keeping the medium same, if frequency changes to 1328 Hz. Calculate
- velcoity of sound
- new wavelength.
The amplitude of the sound wave decides its
Sound travels in air:
Explain the types of mechanical waves.
Name the waves used for sound ranging. State one reason for their use.
