When returning to the earth, spacecraft have a communication blackout, the reason is

the returning spacecraft is doing so against the force of gravity which interferes with the radio waves
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 becomes very much less than the plasma cut-off frequency resulting a total blackout
stellar X-rays attract and absorb the sound waves
the sounds created by the whirring of the mechanism of the spacecraft renders. the sounds inaudible

Question

When returning to the earth, spacecraft have a communication blackout, the reason is

the returning spacecraft is doing so against the force of gravity which interferes with the radio waves
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 becomes very much less than the plasma cut-off frequency resulting a total blackout
stellar X-rays attract and absorb the sound waves
the sounds created by the whirring of the mechanism of the spacecraft renders. the sounds inaudible

anonymous · Answer

?

anonymous · Answer

a) the returning spacecraft is doing so against the force of gravity which interferes with the radio waves

anonymous · Answer

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 becomes very much less than the plasma cut-off frequency resulting a total blackout

anonymous · Answer

c) stellar X-rays attract and absorb the sound waves

anonymous · Answer

d) the sounds created by the whirring of the mechanism of the spacecraft renders. the sounds inaudible