When light reflects from a surface, there is a change in its
A) frequency.
B) wavelength.
C) speed.
D) all of the above
E) none of the above
Answer: E
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Which of the following indicates that the Sun must be gas from its surface to its center?
A) Its low density and high temperature B) Its limited gravitational force C) Its hot spots on the photosphere D) Its weak magnetic field and small diameter
What is gravitational lensing?
A. the temporary disappearance of a star as an object passes in front of it B. the use of Earth's gravity to shape lenses during grinding C. the focusing and brightening of starlight by the gravitational field of a foreground object D. the use of small telescopes to enhance the brightness of stars
A 2.00-kg block of ice at 0.00°C is dropped into a very large lake at 25.0°C and completely melts
For water, the heat of fusion is 3.35 × 105 J/kg, the heat of vaporization is 2.25 × 105 J/kg, and the specific heat is 4190 J/kg ? K. The net change in entropy of the system consisting of the ice and the lake due to this melting process is closest to A) 2.45 × 103 J/K. B) 2.24 × 103 J/K. C) 2.06 × 102 J/K. D) -2.45 × 103 J/K. E) -2.06 × 102 J/K.
A steel pipe (E 5 190 GPa, ? 5 14 3 1026/°C, column d2 5 82 mm, and d1 5 70 mm) of length L 5 4.25 m is subjected to a temperature increase DT. The column is pinned at the top and fixed at the bottom. The temperature increase at which the column will buckle is approximately:
(A) 36 8C
(B) 42 8C
(C) 54 8C
(D) 58 8C