Advertisements
Advertisements
प्रश्न
Name three devices which work on the reflection of sound.
Advertisements
उत्तर
The devices that work on the reflection of sound are
(a) megaphone or bulhhorn,
(b) stethoscope, and
(c) soundboard.
APPEARS IN
संबंधित प्रश्न
Which property of sound leads of the formation of echoes ?
Fill in the blank with suitable word :
Echoes are caused by the ...................... of sound.
In which medium, air or water, an echo is heard much sooner ? Why ?
What is an echo ? How is echo formed ?
What is the minimum distance in air required from a sound reflecting surface to hear an echo (at 20°C) ?
An echo-sounder in a trawler (fishing boat) receives an echo from a shoal of fish 0.4 s after it was sent. If the speed of sound in water is 1500 m/s, how deep is the shoal ?
Answer the following question in your own words.
What should be the dimensions and the shape of classrooms so that no echo can be produced there?
Assertion: The sound which we hear again is called Echo.
Reason: The sensation of sound (Echo) persists in our brain for about 1 s.
Answer the following question in your own words.
What factors are important to get a distinct echo?
Rohan conducted experiments on echo in different media. He observed that a minimum distance of 'x' meters is required for the echo to be heard in oxygen and 'y' meters in benzene. Compare 'x' and 'y'. Justify your answer.
Speed of sound in oxygen: 340 ms-1
Speed of sound in benzene: 200 ms-1
