A photon whose wavelength is = 5.0 × 10^?11 m is scattered straight backward. What is the wavelength of the scattered wave?
a. 5.0 × 10^?11 m
b. 4.5 × 10^?11 m
c. 5.5 × 10^?11 m
d. 6.0 × 10^?11 m
e. 6.5 × 10^?11 m
c
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When charge Q1 is placed at point P1, the resulting potential at point P is V1 . When Q2 is placed at point P2 after Q1 is in position at P1, the resulting potential at P becomes V2 . What is the potential at point P if charge Q1 is then removed?
a. V1 + V2 b. V1 – V2 c. V2 – V1 d. (V1 + V2)/2
A heat engine receives 7 900 J of heat from its combustion process and loses 3 200 J through the exhaust and friction. What is its efficiency?
a. 59% b. 35% c. 21% d. 41% e. 77%
Assume all else is unchanged, and the Earth's rotational axis is perpendicular to the ecliptic. As a result, seasonal variations on the Earth would
a. be practically non-existent. b. remain the same as they are at now. c. have the same severity but each season would last twice as long. d. be much more severe.
The critical angle for sapphire surrounded by air is 34.4°. Calculate the polarizing angle for sapphire
a. 60.5° b. 59.7° c. 58.6° d. 56.3°