Advertisements
Advertisements
Question
Why cannot a sound be heard on the moon? How do astronauts talk to one another on the surface of moon?
Advertisements
Solution
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
RELATED QUESTIONS
Describe with the help of a diagram, how compressions and rarefactions are produced in air near a source of sound.
Fill in the blank.
Sound requires a ________ for propagation.
Name one solid, on liquid and one gas through which sound can travel.
Fill in the blank with suitable word.
Sound cannot travel through ____________.
Through which of the following materials can sound travel? wood, air, water, steam, ice, hydrogen, steel, diamond.
The time interval between a lightning flash and the first sound of thunder was found to be 5 s. If the speed of sound in air is 330 m s-1, find the distance of flash from the observer.
The propagation of sound does not occur through a ______.
Write the answer in your own words.
Explain with the help of practical examples how sound is propagated through solids.
Can we hear sounds of frequencies:
More than 20 KHZ
The small to and fro motion is called vibration.
