How can we determine an asteroid's reflectivity?
A) by determining its mass
B) by comparing its infrared thermal emission to its visible-light reflection
C) by seeing how dark or light it looks in telescopic images
D) by determining how far from the Sun it is
E) by determining its size
B
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Remember Kepler's third law, which relates the period of revolution to the average distance to a planet. How do we modify that law to use with binary stars? a. Add the total mass of the two stars
b. Add Newton's Law of Gravitation. c. Add Einstein's Law of Relativity. d. Add the difference of their masses. e. Add the distance between the two stars.
Einstein's theory of general relativity applies to gravitation
Indicate whether the statement is true or false
How fast is an ion of deuterium moving, assuming rms speed, if it is in a plasma with a temperature of 190 × 10^6 K? (kB = 1.38 × 10^–23 J/K and mD = 2 × 1.66 × 10^–27 kg)
a. 1.54E+6 m/s b. 1.54E+4 m/s c. 2.37E+12 m/s d. 8.89E+5 m/s e. 2.80E+6 m/s
The bell with the highest natural frequency is relatively
A) small. B) large. C) either of these