A floating ice cube contains small pieces of iron. The water level after melting will
A) rise.
B) fall.
C) remain unchanged.
Answer: B
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If continuous spectrum light from a star passes through a cool, low-density gas on its way to your telescope and spectroscope, ____ spectrum on the continuous spectrum results
a. a dark (absorption) line b. a bright (emission) line c. continuous
Two spaceships approach each other along a straight line at a constant relative velocity of 0.9880c as measured by the captain of one of the ships
An observer on Earth is able to measure the speed of only one of the ships as 0.9000c. From the point of view of the observer on Earth, what is the speed of the other ship in terms of the speed of light?
At the moment of a total eclipse, the moon lies along a line from the Earth to the sun. If your normal weight is 600 N, how much is your weight decreased by the combined pull of the sun and moon? MSUN = 2.0 × 10^30 kg, rS-E = 1.5 × 10^8 km MMOON = 7.4 × 10^22 kg, rM-E = 3.8 × 10^5 km
Quasar spectra often show many absorption lines that all appear to be as a result of the same electron transition (such as level 1 to level 2 in hydrogen) but that fall at different wavelengths in the spectrum. Why do we think this is the case?
A) We are seeing absorption lines from clouds of gas that lie between us and the quasar, and therefore each cloud has a different redshift. B) Quasars are rotating rapidly, and this rotation produces spectral lines with a wide variety of Doppler shifts. C) The lines fall at different wavelengths because they are produced by different chemical elements. D) No one knows; it remains perhaps the greatest mystery about quasars.