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प्रश्न
An electric bell is suspended by thin wires in a glass vessel and set ringing. Describe and explain what happens if the air is gradually pumped out of the glass vessel.
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उत्तर
If the air is gradually pumped out of the glass vessel, no sound of the electric bell can be heard because vacuum is created in the vessel and there are no air molecules to carry sound vibrations. Hence, sound waves require material medium for its propagation.
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संबंधित प्रश्न
Select the correct alternative :
Sound cannot travel in
Fill in the blank with suitable word.
Sound cannot travel through ____________.
Through which of the following materials can sound travel? wood, air, water, steam, ice, hydrogen, steel, diamond.
Sound travels in air :
The velocities of sound waves in four media P, Q, R and S are 18,000 km/h, 900 km/h, 0 km/h and 1200 km/h respectively. Which medium could be a liquid substance?
Describe in brief, with the aid of a lebelled diagram, an experiment to demonstrate that a material medium is necessary for propagation of sound.
The time interval between a lightning flash and the first sound of thunder was found to be 5 s. If the speed of sound in air is 330 m s-1, find the distance of flash from the observer.
The propagation of sound does not occur through a ______.
Can we hear sounds of frequencies:
Less than 20 Hz
State three characteristics of the medium required for the propagation of sound.
