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Alternating Current vs Direct Current

Q1:

How long would it take to transmit an electromagnetic wave to a receiving antenna 1,000 miles away?

A 5.38 ms

B 10.8 ms

C 53.8 ms

D 108 ms

ANS:A - 5.38 ms

Frequency = speed of light (in miles)/wavelength.

F = 186,000/1000
F = 186.
Period = 1/T.
Period = 1/186 = 5.38ms.



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