A light beam is incident upon a still water surface. What is the maximum possible value for the angle of refraction? (nwater = 1.333)
a. 76.2°
c. 54.4°
b. 67.5°
d. 48.6°
D
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Three point charges are located on the x-axis at the following positions:
Q1 = +2.00 ?C is at x = 1.00 m, Q2 = +3.00 ?C is at x = 0.00, and Q3 = -5.00 ?C is at x = -1.00 m. What is the magnitude of the electric force on Q2? (k = 1/4??0 = 8.99 × 109 N ? m2/C2 ) A) 0.0540 N B) 0.135 N C) 0.158 N D) 0.0810 N E) 0.189 N
Stars are continually forming in the halo of our Galaxy today
Indicate whether the statement is true or false
Red dwarf stars ____
a. never develop a hydrogen-fusion shell b. create large amounts of carbon and oxygen c. have much shorter lifetimes than Sun-like stars d. never begin hydrogen fusion e. become brown dwarfs after they exhaust their hydrogen core
A light ray bends when it goes from one medium to another because of diffraction
a. True b. False Indicate whether the statement is true or false