Advertisements
Advertisements
प्रश्न
A radio signal, sent towards the surface of the moon, is received in 2.5 seconds. If the speed of the radio waves is 3 × 108 ms−1, find the distance of the moon from the earth.
Advertisements
उत्तर
Let ‘d’ be the required distance. The radio waves then travel a total distance 2d (to and from the moon) in 2.5 seconds.
Hence,
`(2"d")/2.5` = Speed = 3 × 108
d = `3xx10^8xx2.5/2` metre
= 3.75 × 108 metre.
संबंधित प्रश्न
A wire of length 80 cm has a frequency of 256 Hz. Calculate the length of a similar wire under similar tension, which will have frequency 1024 Hz
Name two sound absorbing materials (or objects) which can make our big room less echoey.
Define the term Frequency (as applied to sound waves)
Mention two properties of a wave, one property which varies and the other which remains constant when the wave passes from one medium to another.
How are bats able to fly in the dark?
In what respect does waveforms of noise and a musical note differ. Draw diagrams to illustrate your answer.
Explain why, the ceilings of concert halls are curved.
