Advertisements
Advertisements
प्रश्न
Which of the following statements are correct?
- Sound is produced by vibrations.
- Sound requires a medium for propagation.
- Light and sound both require a medium for propagation.
- Sound travels slower than light.
विकल्प
i & ii only
i, ii & iii only
ii, iii & iv only
i, ii & iv only
Advertisements
उत्तर
i, ii & iv only
Explanation:
Because light can travel in vacuum also but it is only sound that requires a medium to travel.
APPEARS IN
संबंधित प्रश्न
Why are the waves mentioned by you not audible to us?
Name the type of waves produced when a tuning fork is struck in air.
In fig. shows a snap shot of a wave from of frequency 50 Hz in a string. The numbers in the diagram represents distance in centimeters. Fpr the wave motion, find
(a) Wavelength,
(b) Amplitude,
(c) Velocity.
Explain meaning of the terms compression and rarefaction in relation to a longitudinal wave.
Complete the following sentences :
Wave velocity = ________________ × wavelength.
How is sound produced?
he sound of an explosion on the surface of a lake is heard by a boatman 120 m away and by a diver 120 m below the point of explosion. Out of the two persons, who would hear the sound first? Why?
Match the following.
| Ultrasonics | Frequency below 20Hz |
| Speed of sound in air | Needs material medium |
| Infrasonics | 330ms-1 |
| Sound propagation | Frequency more than 20000 Hz |
