If the communication lifetime of civilizations in our galaxy is 10,000 years and our galaxy is 13 billion years old, what is the chance of us detecting another intelligent civilization now?
A) 1 in 13,000
B) 1 in 1,300,000
C) 1 in 1300
D) 1 in 130,000
B
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Fundamental Forces: The ?0 meson has a mass of 264 times that of an electron. What is the approximate range of the force mediated by this particle? (melectron = 9.11 × 10-31 kg, c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s)
A. 1.5 × 10-10 m B. 1.5 × 10-12 m C. 1.5 × 10-14 m D. 1.5 × 10-15 m
If the Andromeda Galaxy collided with the Milky Way, what would most likely happen to Earth?
A) nothing B) The Sun and all its planets would be crushed by collisions with stars and planets from the Andromeda Galaxy. C) The Sun would not be disturbed, but the solar system would be ripped apart. D) The Sun would die, causing Earth to die as well.
Which of the following is NOT a solution to the Fermi Paradox?
A) no one is interested or able to communicate B) we are unable to detect their communications C) we are not interested in communicating D) no one is out there
Which type of force would be the equal and opposite force to a gravitational force?
a. gravitational b. electromagnetic c. strong d. weak e. It could be any one of the above or some combination of them.