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The radius of earth is 8xx10^6m and the ...

The radius of earth is `8xx10^6m` and the height of the TV tower is 100m. What will be the maximum range of the signal Transmission?

A

`40 xx 10^4m`

B

`4 xx 10^4m`

C

`4 xx 10^4cm`

D

`40 xx 10^4km`

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