If they existed, and if they were watching, a civilization at the center of the Milky Way could have detected our first TV signals by now
Indicate whether the statement is true or false
FALSE
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Will a blackbody at temperature T emit more photons per second with energy kBT or with energy 6 kBT?
A. It will emit more photons with the lower energy. B. It will emit more photons with the higher energy. C. The number of photons emitted will be the same. D. One has no way of telling.
Given that our galaxy has a volume of approximately 8 1012 ly3, what is the average distance between civilizations if there are currently 1 million intelligent civilizations in our galaxy?
A) 1,500 ly B) 200 ly C) 320 ly D) 2,800 ly
Three cars (car F, car G, and car H) are moving with the same speed and slam on their brakes. The most massive car is car F, and the least massive is car H
If the tires of all three cars have identical coefficients of kinetic friction with the road surface, which car travels the longest distance to skid to a stop? A) They all travel the same distance in stopping. B) Car F C) Car G D) Car H
Does an electric field exert a force on a stationary charged object?
1.yes 2.no