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(D) The range $d$ for line-of-sight propagation is given by the formula $d = \sqrt{2Rh}$,where $R$ is the radius of the Earth and $h$ is the height of

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$\sqrt{2} d$

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(D) The range $d$ for line-of-sight propagation is given by the formula $d = \sqrt{2Rh}$,where $R$ is the radius of the Earth and $h$ is the height of the antenna.From this formula,we can see that $d \propto \sqrt{h}$.Let the initial range be $d_1 = \sqrt{2Rh}$ and the initial height be $h_1 = h$.Let the new height be $h_2 = 2h$.The new range $d_2$ is given by $d_2 = \sqrt{2Rh_2} = \sqrt{2R(2h)}$.$d_2 = \sqrt{2} 	imes \sqrt{2Rh} = \sqrt{2} d_1$.Therefore,if the height is doubled,the new range becomes $\sqrt{2} d$.

Column $A$	Column $B$
$A$. $D$-layer	$I$. $250-400 \ km$
$B$. $E$-layer	$II$. $170-190 \ km$
$C$. $F_1$-layer	$III$. $95-120 \ km$
$D$. $F_2$-layer	$IV$. $65-75 \ km$

In a communication system,the range for line-of-sight propagation on Earth is $d$ for an antenna height of $h$. If $h$ is doubled,then the new range is:

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