Advertisements
Advertisements
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.
Advertisements
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.
APPEARS IN
संबंधित प्रश्न
Fill in the blank.
Sound can travel in a ______
In which medium sound travels fastest : air, water or steel?
Why cannot a sound be heard on the moon? How do astronauts talk to one another on the surface of moon?
Fill in the blank with suitable word.
Sound cannot travel through ____________.
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?
How long will sound take to travel in (a) and iron rail and (b) air, both 3.3 km in length? Take speed of sound in air to be 330 m/s and in iron to be 5280 m/s.
Does audible range of frequency vary from person and also with the age of the person?
The speed of sound is ______ in solids than in liquids
Rarefactions are the regions of ______ where particles are spread apart.
