The Drake equation calculates N. What is N?
A) the number of intelligences in the entire universe
B) the number of technical civilizations in our galaxy presently
C) the number of stars with habitable planets
D) the number of planets with life in the universe
E) the number of planets in just our galaxy
B
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The terms velocity and speed have identical meanings in physics
a. True b. False Indicate whether the statement is true or false
Time Dilation: An astronaut on a spaceship moving at 0.927c says that the trip between two stationary stars took 4.26 y. How long does this journey appear to take to someone in the rest frame of the two stars?
A. 11.4 y B. 1.60 y C. 2.30 y D. 12.6 y
For the maximum induced emf in the coil of a generator, the term sin ?t has a value of one
Indicate whether the statement is true or false
An excited hydrogen atom is capable of emitting radiation of
A) a single frequency. B) three frequencies. C) many more than three frequencies.