1.Explain why a discharge lamp like Ne produces red light instead of white light
ID: 1481425 • Letter: 1
Question
1.Explain why a discharge lamp like Ne produces red light instead of white light.
options: A) It is not running as hot as a incandescent bulb. B) The electrons in the discharge tube don’t have enough KE to make white light C) A Ne lamp does not emit enough photons per second for the light to appear white D) Ne is an atom with a limited number of electron transitions, the strongest visible transition emits red photons only E) None of the above
2.Just like increasing the power to an incandescent bulb makes its filament hotter and its light whiter, increasing the power to a sodium street light will change its color.
options: A) True B) False
3.What is the energy of a green photon of wavelength 550nm?
options: A) 5.5 E14 J B) 4.2 E-19 J C) 1.2 E-27 J D) 3.6 E-19 J E) 1.1 E-31 J
My laser pointer outputs 3 mW of green light at at 550nm. How many photons leave the pointer each second?
options: A) 8.3 E15 photons/sec B) 1.7 E24 photons/sec C) 7.1 E16 photons/sec D) 1 photon/sec E) 5.5 E18 photons/sec
4.You compare 2 Neon discharge lamps. One is dimmer than the other. The dimmer one is
options: A) Producing fewer photons per second B) Producing lower energy photons C) Running cooler D) All of the above E) B and C only
Explanation / Answer
1) It is not running as hot as a incandescent bulb (A)
2) True (A)
3) E=1240/wavelength
E=3.6 E-19 J (option D)
4) All of the above
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