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Chapter 6: Q18DQ (page 1475)
The most common radium isotope found on earth, , has a half-life of about years. If the earth was formed well over years ago, why is there any radium left now?
All of the nuclides have descended from .
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In Fig. 40.12b, the probability function is zero at the points x= 0 and x= L, the 鈥渨alls鈥� of the box. Does this mean that the particle never strikes the walls? Explain.
Compare the wave functions for the first three energy levels for a particle in a box of width L(see Fig. 40.12a) to the corresponding wave functions for a finite potential well of the same width (see Fig. 40.15a). How does the wavelength in the interval 0鈮� x 鈮� L for the n= 1 level of the particle in a box compare to the corresponding wavelength for the n= 1 level of the finite potential well? Use this to explain why is less than in the situation depicted in Fig. 40.15b.
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?
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鈥檛 they start from rest and accelerate? Explain.
According to the photon model, light carries its energy in packets called quanta or photons. Why then don鈥檛 we see a series of flashes when we look at things?
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