Advertisements
Advertisements
प्रश्न
Describe an experiment to show that sound can travel in a solid.
Advertisements
उत्तर
Take two empty ice-cream cups. Make a small hole at the bottom of each cup and pass a long thread (about 20 m long) through them. Tie a knot or match-stick at each end of the thread so that the thread does not slip out through the holes. This makes a toy – telephone
Now use the toy-telephone as shown in figure and talk to your friend. You will be able to hear the sound of your friend. This shows that sound travels through the thread and reaches your ear. Thus, sound can travel through a solid.
APPEARS IN
संबंधित प्रश्न
Two children are at opposite ends of an aluminium rod. One strikes the end of the rod with a stone. Find the ratio of times taken by the sound wave in air and in aluminium to reach the second child.
Write the approximate speed of sound in water .
What is the time-period of a tuning fork whose frequency is 200 Hz?
Fill in the blanks with suitable words .
Wave speed in metres per second equals frequency in ............ multiplied by ..................... in ..................
The drawing shows a ship 800 m from a cliff. A gun is fixed on the ship. After 5 seconds the people at the front of the ship hear the sound of the gun again.
(a) What is the name of this effect ?
(b) What happens to the sound at the cliff ?
(c) How far does the sound travel in 5 seconds ?
(d) Calculate the speed of sound.
Sunil is standing between two walls. The wall closest to him is at a distance of 660 m. If he shouts, he hears the first echo after 4 s and another after another 2 seconds.
- What is the velocity of sound in air?
- What is the distance between the two walls?
Why does the flash of lighting reach earlier than the sound of thunder?
When temperature increases the speed of sound ______.
The speed of sound in a gaseous medium depends on ______.
Sound travels faster in ______ and slower in ______.
