The angular separation of two stars is 0.1 arcseconds and you photograph them with a telescope that has an angular resolution of 1 arcsecond. What will you see?
A) The photo will seem to show only one star rather than two.
B) The two stars will appear to be touching, looking rather like a small dumbbell.
C) The stars will not show up at all in your photograph.
D) You will see two distinct stars in your photograph.
A) The photo will seem to show only one star rather than two.
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Which of the following best explains why nuclear fusion requires bringing nuclei extremely close together?
A) Nuclei normally repel because they are all positively charged and can be made to stick only when brought close enough for the strong force to take hold. B) Nuclei are attracted to each other by the electromagnetic force, but this force is only strong enough to make nuclei stick when they are close together. C) Nuclei have to be hot to fuse, and the only way to get them hot is to bring them close together. D) Fusion can proceed only by the proton—proton chain, and therefore requires that protons come close enough together to be linked up into a chain.
Which of the following is one way of stating the principle of relativity?
A) The speed of light is relative to the motion of the observer, provided that the observer is not accelerated. B) Experiments conducted entirely within your own lab will come out differently, depending on the state of motion of the lab relative to other reference frames. C) Observers that are accelerated will see light beams move at something other than lightspeed. D) Light has the same speed for all nonaccelerated observers, regardless of the motion of the source or observer. E) No physical experiment, conducted entirely within your own lab, can tell you how fast you are moving relative to anything outside the lab.
Answer the following statement(s) true (T) or false (F)
1. Suppose we have a vial of quantum systems that could either be boxes or harmonic oscillators. When we excite these systems and look at their emission spectra, we see two visible lines, whose wavelengths we measure. From this data, we can determine which kind of system we have. 2. Suppose we measure the wavelengths of the absorption lines of a vibrating diatomic molecule involving atoms whose masses we know. From this data, we can deduce the effective spring constant ks of the bond holding these atoms together.
Which will reach the bottom last?
A. A solid ball B. A hollow ball C. A cylinder D. A piece of pipe E. We need to know the radius and mass of each.