Answer the following questions .
Long - distance radio brodcasts use shorts -wave bands ,Why ?

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Solution

The shortwaves (wavelength less than 200m or frequency greater than 1,500 kHz) are absorbed by the earth due to their high frequency but are effectively reflected by Flayer in the ionophere .

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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 radio telescopes 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?

Q. 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?

Q. The short wave Radio broadcasting band is

Q. Long distance short-wave radio broad casting uses

Q. Assertion: Long distance radio broadcasts use short wave bands.
Reason: The short waves are absorbed by the Earth but reflected by F layer in the ionosphere. After reflection, they reach the surface of the Earth back only at a large distance from the transmitter.

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Answer the following questions .Long - distance radio brodcasts use shorts -wave bands ,Why ?

The shortwaves (wavelength less than 200m or frequency greater than 1,500 kHz) are absorbed by the earth due to their high frequency but are effectively reflected by Flayer in the ionophere .

Answer the following questions .
Long - distance radio brodcasts use shorts -wave bands ,Why ?