What are the different types of sound on the basis of
frequencies?
Give reason:
Why can't astronauts hear each other in space with
the use of microphone?
A bomb explosion on moon cannot be heard.
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Answers
Answer:
Humans can only hear sound waves as distinct pitches when the frequency lies between about 20 Hz and 20 KHz. Sound waves above 20 KHz are known as Ultrasound and is not perceptible by humans. Sound waves below 20 Hz are known as Infrasound. Different animals species have varying Hearing Ranges.
Astronauts cannot hear each other in space with the use of microphone. Because there is nothing out in space (like an atmosphere), the sound waves from one astronaut's whistling can't travel over to the other astronaut's ears. ... When astronauts are inside the International Space Station, they're in a simulated atmosphere. It allows them to breathe without wearing space suits all the time.
A bomb explosion on moon cannot be heard. Since sound waves being mechanical in nature, needs a material medium to travel and in space there is no atmosphere present. So, sound could not be heard in space.