Teaching BPSC बिहार माध्यमिक TGT (9 to 10) शिक्षक भर्ती 4.0 Mock Test Physics

Modulation is required

1

to transmit electrical signals over an antenna through free space.

2

to improve the signal to noise ratio.

3

to make the low frequency signals travel long distance.

4

More than one of the above

5

None of the above

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