Which of these lamps employs semi-conductor technology?
A) incandescent lamp
B) fluorescent lamp
C) CFL
D) LED
Answer: D
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If the electrical potential in a region is constant, the electric field must be zero everywhere in that region
A) True B) False
The ____________________ shows that sunspots are associated with magnetic activity
Fill in the blank(s) with correct word
Which has the larger light-gathering power?
a. a telescope of 5 cm diameter and focal length of 50 cm b. a telescope of 6 cm diameter and focal length of 100 cm c. a telescope of 2 cm diameter and focal length of 100 cm d. a telescope of 3 cm diameter and focal length of 75 cm e. both b and c since they have the same focal length.
The thickness of the disk of the Milky Way is about ________ the diameter of the disk.
A) 1/10th of B) 1/1000th of C) 1/1,000,000th of D) the same as