The instability strip is the region of the H-R diagram in which stars are stable to pulsation
Indicate whether the statement is true or false
False
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Why are molecular lines usually found in infrared and radio regions, not as visible lines?
What will be an ideal response?
At which latitude is the noonday Sun overhead twice a year?
a. 30°S b. 23°S c. 24°N d. 30°N
The technique for producing single crystals of turbine blades is by a modification of
(a) Investment casting (b) Directional solidification (c) The Bridgeman-Stockbarger technique (d) The Czochralski technique
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, which is 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. Carbon-14 has a half-life of 5730 years. If the activity of living matter has been constant over time, how old is the sample of wood? A) 3870 years B) 4250 years C) 4590 years D) 2630 years E) 2940 years