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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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Why do you think the development of Newtonian mechanics preceded the more refined relativistic mechanics by so many years?
Explain why Fig. 38.4 shows that most photoelectrons have kinetic energies less than , and also explain how these smaller kinetic energies occur.
The materials called phosphorsthat coat the inside of a fluorescent lamp convert ultraviolet radiation (from the mercury vapour discharge inside the tube) into visible light. Could one also make a phosphor that converts visible light to ultraviolet? Explain.
Individual atoms have discrete energy levels, but certain solids (which are made up of only individual atoms) show energy bands and gaps. What causes the solids to behave so differently from the atoms of which they are composed?
Figure 40.15a shows that the higher the energy of a bound state for a finite potential well, the more the wave function extends outside the well (into the intervals and ). Explain why this happens.
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