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In the hydrogen spectrum, a line with a wavelength of 410.3 nm is found. (a) what color is the line (b) what is the frequency and (c) what is the energy of the photons.

Answer: 

(a) because of the wavelength of 410,3 nm the corresponding spectrum of hydrogen has a purple color.

(b) F = c/wavelength 

= (3.00 x 108 m/s)/(410,3 x 10-9 m)

= 0,0073 x 1017 Hz

= 73 x 1013 Hz

(c) E = h x F

E = (6,6 x 10-34 J.s) x (73 x 1013 Hz)

E = 481,8 x 10-21 J

E = 48,18 x 10-20 J