The frequency of strong yellow line in the spectrum of sodium is $5.09 \times 10^{14}\ \mathrm{s^{-1}}$. What will be the wavelength in nanometres? (Given $c = 3.0 \times 10^{8}\ \mathrm{m/sec}$)

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A - 589.4 nm. $\lambda = \frac{c}{\nu} = \frac{3.0 \times 10^{8}\ \mathrm{m/s}}{5.09 \times 10^{14}\ \mathrm{s^{-1}}} = 5.894 \times 10^{-7}\ \mathrm{m} = 589.4\ \mathrm{nm}$.

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B - 400 nm

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C - 766.5 nm

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D - 58.94 nm

The frequency of strong yellow line in the spectrum of sodium is \(5.09 \times 10^{14}\ \mathrm{s^{-1}}\). What will be the wavelength in nanometres? (Given \(c = 3.0 \times 10^{8}\ \mathrm{m/sec}\))

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