Fluorescent bulbs have recently become much more efficient due to the introduction of
A) high-emission phosphor coatings on the inside of the bulb.
B) new types of gases, that glow brighter, within the tube.
C) lower density--i.e., lower pressure--gases within the tube.
D) electronically controlled high-frequency ballasts.
E) longer bulbs.
Question 2
Upon being struck by 240-nm photons, a metal ejects electrons with a maximum kinetic energy of 1.45 eV. What is the work function of this metal? (h = 6.626 10-34 J s, c = 3.00 108 m/s, 1 eV = 1.60 10-19 J)
A) 3.73 eV
B) 3.13 eV
C) 4.33 eV
D) 4.92 eV
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