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प्रश्न
Name the type of waves which are used by astronauts to communicate with one another on moon (or in outer space).
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उत्तर
Radio waves are used by astronauts to communicate with one another on moon because radio waves do not require any material medium for its propagation.
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संबंधित प्रश्न
Suppose you and your friend are on the moon. Will you be able to hear any sound produced by your friend?
Can sound travel through a vacuum ? Describe an experiment to explain your answer.
State one observation from everyday life which shows that sound travels much more slow than light.
Which of the following terms apply to sound waves in air and which to water waves?
Transverse, Rarefaction, Trough, Crest, Compression, Longitudinal
State three characteristics of the medium required for propagation of sound?
Compare approximately the speed of sound in air, water and steel.
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.
Assuming the speed of sound in air equal to 340 m/s and in water equal to 1360 m/s, find the time taken to travel a distance 1700 m by sound in (i) air (ii) water.
Can we hear sounds of frequencies:
Less than 20 Hz
Find the odd one out.
