Which space telescope is observing X-rays?
A. the Spitzer Space Telescope
B. the Hubble Space Telescope (HST)
C. the Chandra Observatory
D. the Extreme Ultraviolet Explorer (EUVE)
Answer: C
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What is the wavelength of peak emission for a black body at 37°C? (c = 3.0 × 108 m/s, Wien displacement law constant is 2.9 × 10-3 m • K, ? = 5.67 × 10-8 W/m2 • K4 )
A) 29 µm B) 94 µm C) 7.8 µm D) 9.4 µm E) 78 µm
A magnetic force acts most strongly on a current carrying wire when it
A) carries a very large current. B) is perpendicular to the magnetic field. C) either or both of these D) none of the above
Which of the following quantities is equal to the energy per second generated by fusion in the Sun's core?
A) the force of gravity holding the Sun together B) the temperature of the Sun's core C) the temperature at the Sun's photosphere D) the luminosity of the Sun's photosphere
What type of faulting results from expansive stresses?
a. Reverse b. Normal c. Strike-slip d. Abnormal