A) 1 : 2
B) 4 : 3
C) 2 : 1
D) 5 : 2
Correct Answer: C
Solution :
\[H=\frac{{{V}^{2}}}{R}t\] Þ\[\frac{{{H}_{1}}}{{{H}_{2}}}=\frac{{{R}_{2}}}{{{R}_{1}}}=\frac{4}{2}=\frac{2}{1}\]
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