The first-quarter Moon sets at approximately
a. midnight.
b. noon.
c. 6 P.M.
d. 6 A.M.
a
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Radiation Pressure: Two light beams of different frequency but the same intensity fall on a black (totally absorbing) surface, striking perpendicular to the surface. Which of the following statements are true? (There could be more than one correct choice.)
A. The high-frequency beam exerts more pressure on the surface. B. Both beams exert the same pressure on the surface. C. If the surface were painted white (totally reflecting), the pressure on it would be less than when it was black. D. Painting the surface white would not affect the pressure on it due to these beams. E. The light beams exert no pressure on the surface because light is just energy.
The mercury column in an ordinary medical thermometer doubles in length when its temperature changes from 95? F to 105? F. Choose the correct statement:
A. the coefficient of volume expansion of mercury is 0.1 per F? B. the coefficient of volume expansion of mercury is 0.3 per F? C. the coefficient of volume expansion of mercury is (0.1/3) per F? D. the vacuum above the column helps to "pull up" the mercury this large amount E. none of the above is true
The Bohr model pictures a hydrogen atom in its ground state as a proton and an electron separated by the distance a0 = 0.529 × 10^?10 m. The electric potential created by the electron at the position of the proton is
a. ?13.6 V. b. +13.6 V. c. ?27.2 V. d. +27.2 V. e. +5.12 × 10^9 V.
The process of convection occurs in
A) solids. B) liquids. C) gases. D) fluids. E) none of the above