Advertisements
Advertisements
प्रश्न
Why cannot a sound be heard on the moon? How do astronauts talk to one another on the surface of moon?
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.
APPEARS IN
संबंधित प्रश्न
An electric bell is suspended by thin wires in a glass vessel and set ringing. Describe and explain what happens if the air is gradually pumped out of the glass vessel.
Describe in brief, with the aid of a lebelled diagram, an experiment to demonstrate that a material medium is necessary for propagation of sound.
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.
The propagation of sound does not occur through a ______.
Describe an experiment to prove that a material medium is necessary for the propagation of sound.
Does audible range of frequency vary from person and also with the age of the person?
______ is the distance between two consecutive particles.
______ is the number of vibrations of a particle in the medium, in one second
Rarefactions are the regions of ______ where particles are spread apart.
Find the odd one out.
