Advertisements
Advertisements
प्रश्न
Describe an experiment to prove that a material medium is necessary for the propagation of sound.
Advertisements
उत्तर
A material medium is necessary for the propagation of sound. It can be proved with the help of the following experiment:
An electric circuit consisting of a cell, a switch and an electric bell is arranged inside a bell-jar, which stands on the platform of an evacuating pump.
The switch of the bell is pressed to close the electric circuit. Sound is heard when there is air within the bell-jar. Air is now gradually pumped out of the bell-jar. The intensity of sound goes on decreasing, and no sound is heard when the air is completely removed from the bell-jar. It is because the air which acts as a medium for the propagation of sound energy is removed.
From the above experiment, it is clear that sound can not be heard in the absence of air i.e. a material medium is necessary for the propagation of sound.
APPEARS IN
संबंधित प्रश्न
Select the correct alternative :
Sound cannot travel in
Can two person hear each other on moon’s surface ? Give reason to support your answer.
In which medium sound travels faster : air or hydrogen?
Describe an experiment to show that sound cannot pass through vacuum.
A body vibrating with a time-period of `1/256` s produces a sound wave which travels in air with a velocity of 350 m/s. Calculate the wavelength.
Describe in brief, with the aid of a lebelled diagram, an experiment to demonstrate that a material medium is necessary for propagation of sound.
Can we hear sounds of frequencies:
More than 20 KHZ
When we hear a sound, does any part of our body vibrate? Name the part.
______ is the number of vibrations of a particle in the medium, in one second
Rarefactions are the regions of ______ where particles are spread apart.
