A) 1 : 2
B) 2 : 1
C) 1 : 4
D) 4 : 1
Correct Answer: A
Solution :
\[H=\frac{{{V}^{2}}}{R}.\,t\] Þ \[\frac{{{H}_{1}}}{{{H}_{2}}}=\frac{{{R}_{2}}}{{{R}_{1}}}=\frac{R}{2R}=\frac{1}{2}\]
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