What fraction of the total energy density in a cavity filled with black body radiation at 5000 K is in the range 5.80 × 1014 Hz and 5.85 × 1014 Hz?
A)
5%
B)
10%
C)
1.5%
D)
1%
E)
25%
C
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You walk 53 m to the north, then turn 60° to your right and walk another 45 m. Determine the direction of your displacement vector. Express your answer as an angle relative to east
A) 63° N of E B) 50° N of E C) 57° N of E D) 69° N of E
Imagine another solar system, with a star of the same mass as the Sun. Suppose a planet with a mass twice that of Earth (2MEarth) orbits at a distance of 1 AU from the star. What is the orbital period of this planet?
A) 1 year B) 6 months C) 2 years D) It cannot be determined from the information given.
What is Earth's distance from the Sun?
a. 0.39 AU b. 0.72 AU c. 1.0 AU d. 1.5 AU e. 2.8 AU
Which of these is a consequence of atmospheric refraction?
a. The Sun and Moon appear to set sooner than they actually set. b. The Sun appears smaller when it is directly overhead. c. The Moon appears larger when it is directly overhead. d. Planetary bodies directly overhead appear displaced from that location. e. The Sun and Moon appear to rise sooner than they actually rise.