The H line has a wavelength of 434.0 nm when observed in the laboratory. If the H line appears in a stars spectrum at 434.5 nm, what is the radial velocity of the star?
a. 346 km/s away from the observer
b. 346 km/s toward the observer
c. 1.3 108 m/s away from the observer
d. 1.3 108 m/s toward the observer
e. The radial velocity of the star cannot be determined from this information.
Question 2
Choose the correct word(s) that make the statement true. A (lunar, solar) eclipse occurs when the Moon is (new, quarter, gibbous, full) and the ordering of aligned celestial objects is always Sun, Moon, Earth.
What will be an ideal response?
The Crab Nebula, remnants of a supernova that was first observed around 1050 AD
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