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The wavelength of sodium light in air is 589 nm. (a) Find its frequency in air.

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The wavelength of sodium light in air is 589 nm. (a) Find its frequency in air. (b) Find its wavelength in water (refractive index = 1.33). (c) Find its frequency in water. (d) Find its speed in water.

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Given that, for sodium light, λ= 589 nm = 589 x10–9 m

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