Q. The emission spectrum of gold shows a line of wavelength 2.676 x 10-7 m. How much energy is emitted as the excited electron falls to the lower energy level?
A. 7.43 x 10-19 J
B. 5.30 x 10-20 J
C. 6.05 x 10-19 J
D. 3.60 x 10-20 J
Answer: 7.43 x 10-19 J
