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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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There is a certain probability that a single electron may simultaneously absorb two identical photons from a high-intensity laser. How would such an occurrence affect the threshold frequency and the equations of Section 38.1? Explain.
The saturation current IS for a p-n junction, Eq. (42.22), depends strongly on temperature. Explain why.
In an experiment involving the photoelectric effect, if the intensity of the incident light (having frequency higher than the threshold frequency) is reduced by a factor of 10 without changing anything else, which (if any) of the following statements about this process will be true? (a) The number of photoelectrons will most likely be reduced by a factor of 10. (b) The maximum kinetic energy of the ejected photoelectrons will most likely be reduced by a factor of 10. (c) The maximum speed of the ejected photoelectrons will most likely be reduced by a factor of 10. (d) The maximum speed of the ejected photoelectrons will most likely be reduced by a factor of 110. (e) The time for the first photoelectron to be ejected will be increased by a factor of 10.
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?
Does it make sense to ask, 鈥淚f the universe is expanding, what is it expanding into?鈥�
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