Advertisements
Advertisements
प्रश्न
What is the vacuum? Explain why, sound cannot travel through vacuum?
Advertisements
उत्तर
Vacuum is an empty space that is devoid of matter. Sound wave is an example of mechanical wave that requires material medium for its propagation. Thus, sound waves cannot travel through vacuum.
APPEARS IN
संबंधित प्रश्न
What are ultrasonics? Can you hear the ultrasonic sound?
How is it possible to recognize a person by his voice without seeing him?
State the general name of the waves in which the particles of the medium vibrate :
(i) in the same direction as wave.
(ii) at right angles to the direction of wave.
Distinguish between longitudinal and transverse waves.
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.
Draw displacement-time graph of a wave and show on it the amplitude and time period of wave.
The time interval between a lighting flash and the first sound of thunder was found to be 6 s. If the speed of sound in air is 330 ms-1, find the distance of the flash from the observer.
What do you mean by the frequency of sound?
Name three animals which can hear ultrasonic vibrations.
The sound produced by a thunderstorm is heard 10 s after the lightning is seen. Calculate the approximate distance of the thunder cloud. (Given the speed of sound = 340 m s–1.)
