The emission spectrum of gold shows a line of wavelength 2.68 x10¯7m.
How much energy is emitted as the excited electron falls to a lower orbit?
a. 7.43 x10-¹9J
b. 5.30 x10-20 J
c. 6.05 x10-19 J
d. 3.60 x10-20 J
e. 5.16 x10-2⁰ J
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