While low pressure sodium vapor lamps are the most energy efficient light sources commonly available, producing a pure orange-yellow light with a wavelength of 590 nanometers, high pressure sodium vapor lamps produce a richer spectrum of light that is more pleasing to the eye. One effect that contributes to this richer spectrum is
A. interference-in which light traveling to your eye via several paths within the lamp becomes brighter or darker, depending on how its electric fields interact with one another.
B. radiation trapping-in which the 590 nanometer light has trouble escaping from the lamp.
C. thermionic emission-in which electrons in the hot electrodes enter the gas of the discharge.
D. dispersion-in which the different colors of light travel at different speeds within the lamp.
Answer:B
While low pressure sodium vapor lamps are the most energy efficient light sources commonly available, producing a pure orange-yellow light with a wavelength of 590 nanometers, high pressure sodium vapor lamps produce a richer spectrum of light that is more pleasing to the eye. One effect that contributes to this richer spectrum is
A. interference-in which light traveling to your eye via several paths within the lamp becomes brighter or darker, depending on how its electric fields interact with one another. B. radiation trapping-in which the 590 nanometer light has trouble escaping from the lamp. C. thermionic emission-in which electrons in the hot electrodes enter the gas of the discharge. D. dispersion-in which the different colors of light travel at different speeds within the lamp.