Sound Needs a Medium to travel
Sound Needs a Medium to travel
Sound needs a medium to travel: The substance through which sound travels is called a medium. It can be solid, liquid or a gas. Sound wave is a mechanical wave and requires a material medium like air, water, steel, etc., for its propagation. Sound wave cannot travel in vaccum.This can be proved by bell jar activity.
Activity:
1. An electric bell is suspended inside a bell jar by its leads.
2. A pipe through the cork leads out to vaccum pump(pump which draws the air out of a vessel).
3. The bell is connected to a battery through the key.
4. The bell is started by closing the key. Initailly when jar has normal air inside it, sound waves produced by the ringing bell heard outside the jar.
5. The vaccum pump is started and the air from inside the jar is gradually drawn out. With decreased air inside the jar, sound heard becomes weaker and weaker but the strikes can still be seen to be moving, after sometimes no sound is heard. This suggests that sound needs material medium to travel.
Sound waves cannot pass through _______________ | |||
| Right Option : D | |||
| View Explanation | |||
Sound can travel through | |||
| Right Option : D | |||
| View Explanation | |||
A wave travels through a medium with a speed of 340 m/s. If the frequency of the wave is doubled, what happens to the wave speed ? | |||
| Right Option : B | |||
| View Explanation | |||
Students / Parents Reviews [20]
Abhyas institute is one of the best coaching institute in the vicinity of Ambala Cantt area. The teachers of the institute are well experienced and very helpful in solving the problems of the students.The good thing of the institute is that it is providing extra classes for the students who are w...
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10thAbhyas is an institute of high repute. Yogansh has taken admission last year. It creates abilities in child to prepare for competitive exams. Students are motivated by living prizes on basis of performance in Abhyas exams. He is satisfied with institute.
Yogansh Nyasi
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