The ordering of the atmospheric layers of the Sun from outer to inner is chromosphere, corona, photosphere
a. True
b. False
Indicate whether the statement is true or false
False
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An LR circuit is prepared for an experiment, initially with its switch open. The time constant is that time after switch closure at which the current reaches what percentage of its final value
A. 100% B. 90% C. 37% D. 63% E. 50%
When a nucleus of U-238 absorbs a neutron and becomes U-239, a beta emission, then another beta emission results in
A) Th-239. B) Pa-239. C) U-235. D) Pu-239. E) Pb-206.
When a metal plate with a hole in it is cooled, the size of the hole becomes
1) smaller, 2) larger, 3) remains the same size, and when the plate is heated, the hole becomes 4) smaller. 5) larger. 6) remains the same size.
The theory of nuclear astrophysics is that all the heavy elements like uranium are formed in the interior of massive stars. These stars eventually explode, releasing these elements into space. If we assume that at the time of the explosion there were
equal amount of U-235 and U-238, how long ago did the star(s) explode that released the elements that formed our Earth? The present U-235/U-238 ratio is 0.0070 . [The half-lives of U-235 and U-238 are 0.7 × 10^9 yr and 4.47 × 10^9 yr.]