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A Cheap Spectrophotometer Can Be Made Using a Light-Emitting Diode

Question 87

Multiple Choice

A cheap spectrophotometer can be made using a light-emitting diode (LED) as the source of the light. Assume that you build one of these spectrometers using an LED that gives off green light with a wavelength of 520 nm. What is the energy of a photon of this green light?


A) 1.15 x 10-34 J
B) 1.03 x 10-22 J
C) 3.82 x 10-21 J
D) 3.82 x 10-19 J
E) none of the above

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