Who discovered the nucleus of the atom in 1911?
a. Thomson
b. Rutherford
c. Dalton
d. Bohr
b
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Consider a heavy object which is thrown straight up, reaches its highest point, and then falls back down to the ground. During what parts of the trajectory was it in "FREE FALL"? (assume here that air friction is negligible)
What will be an ideal response?
In fission bombs, a certain "critical mass" is needed because
A) the fissionable material will not reach a sufficiently high temperature unless this much material is present. B) if the mass is too small, too many neutrons pass through the uranium and out the sides without hitting a nucleus. C) too small an amount of uranium will not hold together throughout the reaction, and thus the uranium falls apart and the reaction goes out before it is completed. D) it is impossible to fission a uranium nucleus unless it is near a large number of other uranium nuclei. E) for smaller masses the pressure is so low that neutrons move too slowly through the uranium to sustain a chain reaction.
If you were to unscrew bulb B from its socket (effectively removing it from the circuit and leaving a gap in its place), bulb A would
A. get brighter.
B. become dimmer.
C. remain at the same brightness.
D. go out.
How should we expect that the interstellar medium of the Milky Way will be different in 50 billion years?
A) The total amount of gas will be much less than it is today. B) Thanks to the recycling of the star-gas-star cycle, the interstellar medium should look about the same in 50 billion years as it does today. C) The total amount of gas will be much greater, since many stars will undergo supernovae between now and then. D) The total amount of gas will be about the same, but it will contain a much higher percentage of elements heavier than hydrogen and helium.