Which of the following is the best description of how a fluorescent bulb works?
A) Electrons flowing through the bulb get heated up within the bulb, and these electrons emit light.
B) A gas flows from one end of the bulb to the other, and the gas atoms are energized by the electric field which causes the atoms to emit light.
C) Electrons flow through the bulb, causing a chemical reaction in the gas atoms inside the bulb, which causes these atoms to emit light.
D) A gas fills the bulb and when the gas atoms strike the walls of the bulb the material in the wall emits light.
E) Electrons flow from one end of the bulb to the other, hitting gas atoms and causing them to emit light.
E
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Due to the vast scale of the universe, when we observe a star in the night sky, we are seeing it
A) not as it is now, but as it will be in the future B) as it was at the moment the universe formed C) as it is right now D) not as it is now, but as it was in the past
Using K = 3/2 kT, what is the average kinetic energy of a He atom at:
(a) 10. K? (b) -196.°C? (c) 100.°C?
A metal surface has a work function of 2.50 eV. What is the longest wavelength of light that will eject electrons from the surface of this metal?
(1 eV = 1.60 × 10-19 J, c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s)
The cataclysmic explosion of a star that throws most of its matter into space is called a(n) ______________
Fill in the blank(s) with correct word