The wavelength of sodium light in air is 589 nm. (a) Find its frquency in air. (b) Find its wavelength in water (refactive index = 1.33). (c ) find its frequency in water : (d) Find its speed in water.
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Here, `lambda_(0) = 589 nm = 589 xx 10^(-9)m, mu = 1.33` `lambda = (lambda_(0))/(mu) = (589)/(1.33) = 442.85 nm` `v = v_(0) = ( c)/(lambda_(0)) = (3 xx 10^(8))/(589 xx 10^(-9)) = 5.09 xx 10^(14) Hz` `v = ( c)/(mu) = (3 xx 10^(8))/(1.33)m//s = 2.25 xx 10^(8)m//s`
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