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

Physics & Space Science

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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?

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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

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In the southern hemisphere, the vernal equinox occurs on or around

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