Question

sound needs a medium to travel prove

Answer 1

Answer:

sound is a mechanical wave which needs a medium like air, for its propagation.

Answer 2

ANSWER

• Sound is a mechanical wave that needs a material medium like air, water, steel, etc., for its propagation.
• A sound wave travels in the form of a longitudinal wave and it requires a material medium for its propagation.
• Sound always originates from some vibrating body.
• These vibrations are produced by tuning forks, drums, bells, the strings of a guitar, etc.
• The bell jar experiment is a common experiment used to demonstrate that sound needs a medium to travel.
• A bell jar is a laboratory equipment used for creating a vacuum. It is so named as its shape is similar to that of a bell.
• A bell jar is placed on a base which is vented to a hose fitting that can be connected via a hose to a vacuum pump.
• By pumping the air out of the bell jar, the air pressure inside the jar can be varied.
• The experiment is done by placing an electrical bell in the bell jar.
• As the air is pumped out of the sealed bell jar, the sound from the bell jar fades.
• At a particular vacuum, no more sound is heard from the bell, but we can see that the hammer continues hitting the gong and sound is produced.
• However, the sound is not audible to our ears because of the vacuum inside the jar.
• This demonstrates that the sound wave cannot travel through vacuum.
• That is, a sound wave needs a material medium for its propagation.