Author Question: Fluorescent bulbs have recently become much more efficient due to the introduction of A) ... (Read 30 times)

rayancarla1 · **on:** Jul 29, 2018

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 · **Reply #1 on:** Jul 29, 2018

Answer to Question 1

D

Answer to Question 2

A

rayancarla1 · **Reply #2 on:** Jul 29, 2018

Both answers were spot on, thank you once again

vseab · **Reply #3 on:** Jul 29, 2018

Great! Please up vote

Author Question: Fluorescent bulbs have recently become much more efficient due to the introduction of A) ... (Read 30 times)

rayancarla1

Fluorescent bulbs have recently become much more efficient due to the introduction of A) ...

vseab

Fluorescent bulbs have recently become much more efficient due to the introduction of A) ...

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rayancarla1

Fluorescent bulbs have recently become much more efficient due to the introduction of A) ...

vseab

Fluorescent bulbs have recently become much more efficient due to the introduction of A) ...