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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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Qualitatively, how would you expect the probability for a particle to tunnel through a potential barrier to depend on the height of the barrier? Explain.
In Fig. 40.12b, the probability function is zero at the points x= 0 and x= L, the “walls” of the box. Does this mean that the particle never strikes the walls? Explain.
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.
The electrical conductivities of most metals decrease gradually with increasing temperature, but the intrinsic conductivity of semiconductors always increases rapidly with increasing temperature. What causes the difference?
Neutrons have a magnetic dipole moment and can undergo spin flips by absorbing electromagnetic radiation. Why, then, are protons rather than neutrons used in MRI of body tissues?
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