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Long distance radio broadcasts use short...

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

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short radio waves are reflected by ionosphere.
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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

Knowledge Check

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

    A
    Both Statement-1 and Statement-2 are true, and Statement-2 is the correct explanation of Statement-1.
    B
    Both Statement-1 and Statement-2 are true but Statement -2 is not the correct explanation of Statement-1
    C
    Statement-1 is true but Statement-2 is false.
    D
    Statement-1 is false but Statement-2 is true.

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

    A
    If both Assertion & Reason are true and the reason is the correct explanation of the assertion, then mark (1)
    B
    If both Assertion & Reason are true but the reason is not the correct explanation of the assertion, then mark (2)
    C
    If assertion is true statement but Reason is false, then mark (3)
    D
    If both Assertion and Reason are false statements, then mark (4)

  • Long distance short-wave radio broadcasting uses

    A
    ground wave
    B
    lonospheric wave
    C
    direct wave
    D
    sky wave