If we develop spacecraft that can take humans to nearby solar systems at a few percent of the speed of light, how long would it be before we could conceivably populate all habitable planets in the entire Milky Way?
A) a few hundred thousand years
B) a few million years
C) a few hundreds of millions of years
D) a few billion years
E) We could never colonize the galaxy unless we had ships that could travel very close to the speed of light.
B
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Uranus' moon Ariel shows considerable surface activity, a surprise considering its small size
Indicate whether the statement is true or false
What is the wavelength in the Balmer series corresponding to a value of n = 15?
A) 277.1 nm B) 371.1 nm C) 188.6 nm D) 656 nm E) 754.2 nm
Generally speaking, activity on the surface of the Sun is primarily driven by
A. electromagnetism. B. gravity. C. nuclear reactions. D. thermodynamics.
Appliances in the USA are designed to work on 110-120 V, whereas appliances in Europe operate on 220-240 V. What would happen if you tried to use a European electric shaver in this country?
A) It would probably work as well as it does in Europe, since it is the power rating, not the voltage rating, that matters. B) It would probably work as well as it does in Europe, since it is the current rating, not the voltage rating, that matters. C) It would barely work (or maybe not work at all), since the voltage here is too low to push enough current through the device. D) It would probably overheat and burn up before very long. E) This question cannot be answered without knowing the frequency used in Europe and in the USA, since this is the parameter that matters most in any electrical device that operates on alternating current.