An electromagnetic wave of frequency 5.0 x 10¹⁴Hz, is incident on the surface of water of refractive index $\frac{4}{3}$ . Taking the speed of the wave in air as 3.0 x 10⁸ms^-1, calculate the wavelength of the wave in water.

2.2 x 10^-6m

1.7 x 10^-7m

8.0 x 10^-7m

6.0 x 10^-7m

4.5 x 10^-7m

Correct answer is E

$_an_w = \frac{\lambda_a}{\lambda_w}$

$\frac{4}{3} = \frac{\lambda_a}{\lambda}$

$\lambda_w = \frac{v}{f}$

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

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

= 4.5 x 10^-7m

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An electromagnetic wave of frequency 5.0 x 10¹⁴Hz, is incident on the surface of water of refractive index $\frac{4}{3}$ . Taking the speed of the wave in air as 3.0 x 10⁸ms^-1, calculate the wavelength of the wave in water.

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