A light wave of frequency 5 x 10 14 Hz moves through water which has
PHYSICS
JAMB 1990
A light wave of frequency 5 x 1014Hz moves through water which has a refractive index of \(\frac{4}{3}\). Calculate the wavelength in water if the velocity of light in air is 3 x 108ms-1
- A. 4.5 x 10-7m
- B. 6.0 x 10-7m
- C. 1.7 x 106m
- D. 2.2 x 106m
Correct Answer: A. 4.5 x 10-7m
Explanation
\(\frac{1}{4}\) = \(\frac{3 \times 10}{v}\)
v = 2.25 x 108ms-1
\(\lambda\) = \(\frac{V}{F}\)
= \(\frac{2.25 \times 10^8}{5 \times 10^14}\)
\(\lambda\) = 0.45 x 10-6m
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