Author Question: Fluorescent bulbs have recently become much more efficient due to the introduction of A) ... (Read 40 times)

rayancarla1

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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



vseab

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Answer to Question 1

D

Answer to Question 2

A



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rayancarla1

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Both answers were spot on, thank you once again



vseab

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