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Physics - Sodium Light Wavelength and Energy

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For a yellow sodium light emission, with a frequency of 5.09 x 1011 Hz
a) What is the wavelength in nm?
b) Calculate the energy of the light.

(c = 3.00 x 108 m/s, h = 6.63 x 10-34 j-s, Rh = 2.18 x 10-18J)

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