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Chapter 6: Q5DQ (page 1519)
When adecays to two photons, what happens to the quarks of which it was made?
The two quarks annihilate each other, thus, releasing the two gamma photons.
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The magnetic field in a cyclotron that accelerates protons is . (a) How many times per second should the potential across the Dees reverse? (This is twice the frequency of the circulating protons.) (b) The maximum radius of the cyclotron is . What is the maximum speed of the proton? (c) Through what potential difference must the proton be accelerated from rest to give it the speed that you calculated in part (b)?
The theory of relativity sets an upper limit on the speed that a particle can have. Are there also limits on the energy and momentum of a particle? Explain.
In Fig. 40.28, how does the probability of finding a particle in the center half of the region compare to the probability of finding the particle in the outer half of the region? Is this consistent with the physical interpretation of the situation?
Since lead is a stable element, why doesn’t the decay series shown in Fig. 43.7 stop at lead, ?
A student asserts that a material particle must always have a speed slower than that of light, and a massless particle must always move at exactly the speed of light. Is she correct? If so, how do massless particles such as photons and neutrinos acquire this speed? Can’t they start from rest and accelerate? Explain.
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