Nuclear Reactions: Determine the missing product X in the following nuclear reaction: 
B + neutron ? X + alpha particle
Fill in the blank(s) with the appropriate word(s).
7 is over 3Li
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One reason a photon could not create an odd number of electrons and positrons is that such a process would
A) not conserve charge. B) not conserve energy. C) require photon energies that are not attainable. D) result in the creation of mass. E) result in the destruction of mass.
Which of the following correctly describes the meridian in your sky?
A) a half-circle extending from your horizon due east, through your zenith, to your horizon due west B) a half-circle extending from your horizon due north, through your zenith, to your horizon due south C) a half-circle extending from your horizon due east, through the north celestial pole, to your horizon due west D) the point directly over your head E) the boundary between the portion of the celestial sphere you can see at any moment and the portion that you cannot see
Which one of the choices below represents the preferred practice regarding significant figures when multiplying the following: 15.0 × 5.6 × 2.33?
a. 200 b. 195.720 c. 195.72 d. 195.7 e. 196
The weight that will cause a wire of diameter d to stretch a given distance, for a fixed length of wire, is
A) independent of d. B) proportional to d. C) proportional to d2. D) independent of what the length of the wire is.