The critical angle for a beam of light passing from water into air is 48.8°. This means that all light rays with an angle of incidence greater than this angle will be
A) absorbed.
B) totally transmitted.
C) partially reflected and partially transmitted.
D) totally reflected.
E) totally polarized.
D
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A meterstick is supported by a knife-edge at the 50-cm mark. Doug hangs masses of 0.40 and 0.60 kg from the 35-cm and 80-cm marks, respectively. Where should Doug hang a third mass of 0.30 kg to keep the stick balanced?
a. 20 cm c. 30 cm b. 70 cm d. 10 cm
Optics of the Eye: For an eye that is 2.4 cm in diameter, what must be the range of focal lengths of the lens to focus objects from the near point (25 cm) to infinity on the retina?
Fill in the blank(s) with the appropriate word(s).
According to the second law of thermodynamics, for any process that may occur within an isolated system, which one of the choices applies?
A) Entropy remains constant. B) Entropy increases. C) Entropy decreases. D) Both A and B are possible. E) Both A and C are possible.
The angular speed of the minute hand of a clock, in rad/s, is
A.
.B.
.C.
.D.
E.