Correct Answer: Option E

Explanation

\(_an_w = \frac{\lambda_a}{\lambda_w}\)

\(\frac{4}{3} = \frac{\lambda_a}{\lambda}\)

\(\lambda_w = \frac{v}{f}\)

= \(\frac{3.0 \times 10^8}{5.0 \times 10^{14}} = 0.6 \times 10^{-6}\)

\(\lambda_w = \frac{3}{4} \lambda_a = \frac{3}{4} \times 0.6 \times 10^{-6}\)

= 4.5 x 10^-7m

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