The radius of a star is 6.95 × 108 m, and its rate of radiation has been measured to be 5.32 × 1026 W. Assuming that it is a perfect emitter, what is the temperature of the surface of this star? (? = 5.67 × 10-8 W/m2 ? K4 )
A) 6.27 × 103 K B) 8.25 × 103 K C) 5.78 × 107 K D) 3.93 × 107 K E) 8.87 × 103 K
A
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Most terrestrial planets have portions of their surface that appear to be significantly older than other portions of their surface. What evidence suggests that the surface of Venus is all of the same age?
a. Photos taken by probes that landed on Venus showed that all of the rocks were of the same age. b. The craters on Venus are randomly distributed in size and number across the surface. c. The volcanoes on Venus are not found in isolated groups, but are scattered around the planet. d. a and b e. all of the above
Radioactivity Basics: A nucleus 
X undergoes one alpha decay followed by 3 beta-minus decays.(a) What is the resulting nucleus in terms of M and N?(b) If there had been 3 beta-plus decays instead of the beta-minus decays, what would have been the resulting nucleus in terms of M and N?
What will be an ideal response?
Suppose that at a certain instant of time, the wave function shown below describes a certain quanton’s state. 
If we were to perform an experiment to locate the quanton, what would be the most likely result or results?
A. 
B. 
C. 
D. 
A traveler pulls on a suitcase strap at an angle 36° above the horizontal. If of work are done by the strap while moving the suitcase a horizontal distance of 15 m, what is the tension in the strap?
A) 75 N B) 61 N C) 85 N D) 92 N