Even relatively small astronomical telescopes are ordinarily not used for terrestrial observation because
a. their images are too bright.
b. their images are too dim.
c. their images are inverted.
d. their images are not in color.
c
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Wood boards ΒΌ inch thick have a moisture content of 60% by mass. If the diffusivity of water in wood is taken as 3 x 10^-10ft^2/s, estimate the time for the wood to have a moisture content of 5% at its center if the air surrounding the boards was originally dry and hD (the convective mass transfer coefficient) is 1 x 10^-8ft/s.
What will be an ideal response?
For large mass number nuclei which are stable, the ratio of protons to neutrons is
a. equal to 1 b. greater than 1 c. less than 1 d. unrelated to the stability of nuclei e. almost 2 to 1
If the Sun ceased to generate nuclear fusion in its core, the Sun would immediately begin to collapse inward
a. True b. False Indicate whether the statement is true or false
How many possible sets of quantum numbers (electron states) are there in the 5f subshell?
A) 2 B) 6 C) 8 D) 10 E) 14