[CBSE PMT 1999]
A) $ 2\times 10^{6}m $
B) $ 3\times 10^{6}m $
C) $ 4\times 10^{6}m $
D) $ 5\times 10^{6}m $
Correct Answer: B
$ \lambda =\frac{c}{\nu }=\frac{3\times 10^{8}}{100}=3\times 10^{6}m $
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