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Chapter 6: Q8DQ (page 1519)
According to the standard model of the fundamental particles, what are the similarities between quarks and leptons? What are the most important differences?
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BIO One problem in radiocarbon dating of biological samples, especially very old ones, is that they can easily be contaminated with modern biological material during the measurement process. What effect would such contamination have on the estimated age? Why is such contamination a more serious problem for samples of older material than for samples of younger material?
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.
Does the universe have a center? Explain.
An electron with a total energy of collides with a stationary positron. (a) What is the available energy? (b) If the electron and positron are accelerated in a collider, what total energy corresponds to the same available energy as in part (a)?
In Example 43.9 (Section 43.4), the activity of atmospheric carbon before was given. Discuss why this activity may have changed since.
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