The number of cycles to failure in polycrystalline ceramics is the number of cycles in crack _________.
Fill in the blank(s) with the appropriate word(s).
propagation
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Carbon-14 has a half-life of 5730 years. 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) 3870 years B) 4250 years C) 4590 years D) 2630 years E) 2940 years
If the Earth didn't have an atmosphere what would happen to its temperature?
a. It would go up. b. It would go down. c. It wouldn’t change.
A 110-V hair dryer is rated at 1200 W. What current will it draw when operating from a 110-V electrical outlet?
A) 90 mA B) 1.0 A C) 5.0 A D) 11 A E) 14 A
What is the angular separation of two spectral lines of wavelengths 497 nm and 251 nm formed in the third order with a grating having 587 lines per millimeter?
A) 34.8° B) 24.8° C) 41.3° D) 29.4° E) 4.21°