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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
Cite an experiment to show that sound needs a material medium for its propagation.
Sound cannot travel in vacuum.
Fill in the blank.
Sound requires a ________ for propagation.
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(a) in which medium sound travels slowest?
(b) in which medium sound travels fastest?
Define the terms 'frequency', 'wavelength' and 'velocity' of a sound wave. What is the relation between them?
The sound waves travel fastest :
State three characteristics of the medium required for propagation of sound?
How does the speed of sound in air vary with temperature?
How long will sound take to travel in (a) and iron rail and (b) air, both 3.3 km in length? Take speed of sound in air to be 330 m/s and in iron to be 5280 m/s.
The speed of sound is ______ in solids than in liquids
