Carbon-14 has a half-life of 5730 y. A sample of wood has been recovered by an archaeologist. The sample is sent to a laboratory,
where it is determined that the activity of the sample is 0.144 Bq/g. By comparing this activity with the activity of living organic matter, 0.230 Bq/g, the scientist determines how old the wood sample is, or more precisely, when the tree that the sample came from died. How old is the sample of wood?
A) 2940 y B) 3870 y C) 2630 y D) 4250 y E) 4590 y
B
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A) vertical B) horizontal C) slanted D) curved E) a circle
Suppose you live at the North Pole. Describe the path of the Sun through your sky for each of the following days: a. the day of the spring equinox b. the day of the summer solstice c. the day of the winter solstice
What will be an ideal response?
Monochromatic light is incident on a grating that is 75 mm wide and ruled with 50,000 lines. The second-order maximum is seen at 32.5°. What is the wavelength of the incident light?
A) 202 nm B) 403 nm C) 452 nm D) 605 nm E) 806 nm