An emission line results from an electron falling from a higher to lower energy orbital around its atomic nucleus.

The radiation our eyes are most sensitive to lies in the color:

_________ is the only planet with a mean density less than water.

In the Kelvin scale, absolute zero lies at

Observations in the x-ray portion of the spectrum are not usually done from the surface of the earth.

Find the domain of the function:   Choose your answer below and be sure to show all of your work on your paper.

Changing the electric field will affect the magnetic field of a body.

Find the difference quotient for

The Sun’s blackbody curve peaks in the __________ portion of the spectrum.

All the planets revolve around the Sun in the same direction.