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Long distance radio broadcasts use short...

Long distance radio broadcasts use short - wave bands. Why ?

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Because in SW band, radio waves of frequency 4.75 MHz to 9.9 MHz whose very long distance transmission is possible by ionosphere.
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KUMAR PRAKASHAN-ELECTROMAGNETIC WAVES-SECTION B NUMERICALS (Numerical From Textual Exercise)
  1. In a plane electromagnetic wave, the electric field oscillates sinusoi...

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  2. Suppose that the electric field part of an electromagnetic wave in vac...

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  3. Suppose that the electric field part of an electromagnetic wave in vac...

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  4. Suppose that the electric field part of an electromagnetic wave in vac...

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  5. Suppose that the electric field part of an electromagnetic wave in vac...

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  6. Suppose that the electric field part of an electromagnetic wave in vac...

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  7. About 5% of the power of a 100 W light bulb is converted to visible ra...

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  8. About 5% of the power of a 100 W light bulb is converted to visible ra...

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  9. Use the formula lambda(m)T=0.29 cm K to obtain the characteristic temp...

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  10. Given below are some famous numbers associated with electromagnetic ra...

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  11. Given below are some famous numbers associated with electromagnetic ra...

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  12. Given below are some famous numbers associated with electromagnetic ra...

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  13. Given below are some famous numbers associated with electromagnetic ra...

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  14. Given below are some famous numbers associated with electromagnetic ra...

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  15. Long distance radio broadcasts use short - wave bands. Why ?

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  16. It is necessary to use satellites for ling distance TV transmission. W...

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  17. Optical and radiotelescopes are built on the ground but X - ray astron...

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  18. The small ozone layer on top of the stratosphere is crucial for human ...

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  19. If the earth did not have an atmosphere, would its average surface tem...

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  20. Some scientists have predicted that a global nuclear war on the earth ...

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