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The Speed of EM Waves

Beyond which ...

Question

Beyond which frequency, the ionosphere bands any incident electromagnetic radiation but do not reflect it back towards the earth?

A

50 M H z

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B

40 M H z

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C

30 M H z

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D

20 M H z

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Solution

The correct option is B $40 M H z$
The ionosphere can reflect electromagnetic waves of frequency less than $40 M H z$ but not of frequency more than $40 M H z$ .

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Similar questions

Q. Beyond which frequency, the ionosphere bends any incident electromagnetic radiation but do not reflect it back towards the earth?

Q. If critical frequency for ionosphere is 30MHz. Calculate the maximum frequency which can come back on earth if transmitted at an angle

60^{0}

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Q. Statement A: At great heights from the surface of earth , ionisation of air molecules is low
Statement B: Electromagnetic waves of frequencies beyond 30 MHz penetrate ionosphere and escape

Q. The waves which are reflected back to the earth by ionosphere is.

Q. Assertion: TV signals cannot be transmitted via sky wave propagation.
Reason: Ionosphere cannot reflect radio waves of frequencies greater than 40MHz.

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