Escape Speed: The mass of Earth is 9.31 times the mass of Mars, and the radius of Earth is 1.88 times the radius of Mars. The escape speed for Mars is what percent of the escape speed for Earth?
A. 222%
B. 22.5%
C. 44.9%
D. 66.2%
E. 20.2%
Answer: C
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The star named Sheat is of M2 II spectral type and luminosity class. Based on this information, which of the following are true? I. Sheat has a surface temperature less than the sun. II. Sheat has a diameter that is greater than that of the sun. III. Sheat is more luminous than the sun. IV. Sheat is located near the upper left hand corner in the HR diagram
a. I & II b. II & IV c. II, III, & IV d. I, II, & III e. I, II, III, & IV
If the spectrum of a sunspot shows that it has a maximum intensity at 650 nm, what is the temperature of the sunspot?
a. 650 K b. 5000 K c. 1950 K d. 4600 K e. 10,000 K
A small source radiates an electromagnetic wave with a single frequency into vacuum, equally in all directions. As the wave moves, its frequency:
1.increases. 2.decreases. 3.stays constant.
The "after glow" from some clock faces is caused by atoms
1) being excited, 2) vibrating at frequencies greater than a million billion times per second, 3) remaining for some time in a state of excitation before de-exciting, and materials exhibiting this property are called 4) fluorescent. 5) phosphorescent. 6) incandescent. 7) luminescent.