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A tower of height 6 m covers a population of

1. $6\times10^2$
2. $6\times10^3$
3. $6\times10^4$
4. $6\times10^6$

Correct answer: $6\times10^3$

Solution

This is a standard line-of-sight communication estimate. For a tower of height 6 m, the coverage is of the order of a few kilometres, corresponding to a population on the order of $10^3$ in typical textbook assumptions. Hence the best option is $6\times10^3$.

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