Neutral hydrogen can be detected because its electron occasionally ________ its spin and creates the 21-cm emission line for radio observers
Fill in the blank(s) with correct word
flips or switches or reverses
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Rita raises a 10kg package to a height of 2.5 m in 2.0 s
(a) How much work did she do on the package? (b) How much power was expended on the package? (c) If she were to raise the package in 1.0 s rather than 2.0 s, how do the work and power change?
What is spectral resolution? Why can a large telescope allow for a higher spectral resolution than a smaller telescope?
What will be an ideal response?
In an ideal case rays coming from an object toward a lens or mirror should be reasonably close to the optical axis. To the extent that this condition is not completely met, which one of the following effects occurs?
a. mirages c. spherical aberration b. chromatic aberration d. light scattering
In the southern hemisphere, the vernal equinox occurs on or around
What will be an ideal response?