How might you distinguish a sodium-vapor street lamp from a mercury-vapor street lamp?
A. The shadows cast from a sodium-vapor street lamp tend to be more diffuse around the edges.
B. Ask your local utility company to identify these lamps for you.
C. Look at the street lamps through a spectroscope and match their spectral patterns to their respective atomic spectra.
D. Use binoculars to look for printing adjacent to the bulb.
Answer: C
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