Question

The wavelength of a violent light is 40nm. Calculate its frequency and wave number

Answer 1

Wavelength = L = 40nm = 40×10^-9m

Frequency = c/L

$= \frac{3 \times {10}^{8} }{40 \times {10}^{ - 9} } = 0.075 \times {10}^{17} \\ = 7.5 \times {10}^{15}$

Wave number = 1/L = 1/40×10^-9

$0.025 \times {10}^{9} = 2.5 \times 10 {}^{7}$

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