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Long distance radio broadcasts use short...

Long distance radio broadcasts use short wave bands. Explain why?

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The short waves are the waves of wavelength
less than 200 m or frequency greater than
1.5 MHz. They are absorbed by the earth due to
their high frequency. These waves are reflected
from ionosphere. These waves after reflection
from ionosphere reach the surface of earth only
at a large distance from the place of
transmission. It means attenuation is less for
short waves. It is due to this reason, the short
waves are used in long distance broadcasts.
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Why long distance radio broadcasts use shortwave bands?

Statement 1: Long distance radio broadcasts use short wave bands. Statement 2: Short wavelength signals are reflected by the ionosphere.

Give reasons for the following: (i) Long distance radio broadcasts use short-wave bands. (ii) The small ozone layer on top of the stratosphere is crucial for human survival. (iii) Satellites are used for long distance TV transmission.

Answer the following questions: (a) Long distance radio broadcasts use short-wave bands. Why? (b) It is necessary to use satellites for long distance TV transmission. Why? (c) Optical and radiotelescopes are built on the ground but X-ray astronomy is possible only from satellites orbiting the earth. Why? (d) The small ozone layer on top of the stratosphere is crucial for human survival. Why? (e) If the earth did not have an atmosphere, would its average surface temperature be higher or lower than what it is now? (f) Some scientists have predicted that a global nuclear war on the earth would be followed by a severe ‘nuclear winter’ with a devastating effect on life on earth. What might be the basis of this prediction? Answer the following questions: (a) Long distance radio broadcasts use short-wave bands. Why? (b) It is necessary to use satellites for long distance TV transmission. Why? (c) Optical and radiotelescopes are built on the ground but X-ray astronomy is possible only from satellites orbiting the earth. Why? (d) The small ozone layer on top of the stratosphere is crucial for human survival. Why? (e) If the earth did not have an atmosphere, would its average surface temperature be higher or lower than what it is now? (f) Some scientists have predicted that a global nuclear war on the earth would be followed by a severe ‘nuclear winter’ with a devastating effect on life on earth. What might be the basis of this prediction?

A : Long distance radio broadcasts use short-wave bands. R : Ionosphere reflectes waves in these bands.

Long distance short-wave radio broadcasting uses