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प्रश्न
Sound is a ______ wave and needs a material medium to travel.
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उत्तर
Sound is a longitudinal wave and needs a material medium to travel.
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संबंधित प्रश्न
Define time period.
On what factor does the loudness of a sound depend ?
How does the loudness of sound produced depend on the vibrating area of the body ?
Why are the waves mentioned by you not audible to us?
What is the vacuum? Explain why, sound cannot travel through vacuum?
A cannon is fired at A (see diagram). An observer at B hears two sounds. The first sound is heard after 1 second and the second 3s after the observer sees the flash. (Velocity of sound = 340 ms−1)
(i) Why does the observer see the flash before he hears the sound?
(ii) Calculate the distance x between the observer and the wall.
Match the pairs.
| Group ‘A’ | Group ‘B’ |
| (a) Flute | (1) Frequency less than 20 Hz |
| (b) Frequency | (2) Frequency more than 20000 Hz |
| (c) Sound level | (3) Vibrations in the air |
| (d) Ultrasonic sound | (4) Measured in Hz |
| (e) Infrasonic sound | (5) Decibel |
State the effect of pressure on the speed of sound in air.
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?
Rapid back and forth motion of a particle about its mean position is called _____.
