[1999]
(a) $2 \times 16^{6} $ $m$
(b) $3 \times 10^{6} $ $m$
(c) $4 \times 10^{6} $ $m$
(d) $5 \times 10^{6} $ $m$
Correct Answer: 13.(b)
Solution:
$v=n \lambda$
$\lambda=\frac{3 \times 10^{8}}{100}$
[where, velocity of light $(v)=3 \times 10^{8} $ $m / s$ ]
$\lambda=3 \times 10^{6} $ $m$.
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