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प्रश्न
Why cannot a sound be heard on the moon? How do astronauts talk to one another on the surface of moon?
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उत्तर
Sound cannot be heard on the surface of moon because there is no air on the moon to carry the sound waves. Hence, sound waves cannot be propagated in vacuum.
Astronauts talk to one another on the surface of moon through wireless sets that uses radio waves. This is because radio waves can travel through vacuum, whereas sound waves cannot travel through vacuum as they require material medium for their propagation.
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संबंधित प्रश्न
Describe with the help of a diagram, how compressions and rarefactions are produced in air near a source of sound.
Cite an experiment to show that sound needs a material medium for its propagation.
Can sound travel through a vacuum ? Describe an experiment to explain your answer.
In which medium sound travels faster : air or hydrogen?
The frequency of the sound emitted by the loudspeaker is 1020 Hz. Calculate the wavelength of the sound wave in air in cm where its velocity is 340 m/s.
The velocities of sound waves in four media P, Q, R and S are 18,000 km/h, 900 km/h, 0 km/h and 1200 km/h respectively. Which medium could be a liquid substance?
Explain the experiment, with a neat diagram, to prove the following:
'Sound needs material medium for propagation.'
A boy fires a gun and another boy at a distance hears the sound of fire 2.5s after seeing the flash. If the speed of sound in air 340 m/s, find distance between the boys.
Write the answer in your own words.
Explain with the help of practical examples how sound is propagated through solids.
Describe an experiment to prove that a material medium is necessary for the propagation of sound.
