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When returning to the earth, spacecraft has a communication
blackout. The reason is:
(A) The returning spacecraft is doing so against the force
of gravity, which inter-feres with the radio waves
(B) During the re-entry period, the density of the plasma,
generated by the intense frictional heat, is so high that
the operational frequencies used for communication be come
very much less than the plasma cut-off frequency, resulting
in a total blackout
(C) Stellar X-rays attract and absorb the sound waves
(D) None of the above
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Answer Posted / guest
( B ) During the re-entry period, the density of the plasma,
generated by the intense frictional heat, is so high that
the operational frequencies used for communication be come
very much less than the plasma cut-off frequency, resulting
in a total blackout
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