The look-back time of an object is directly related to its:
A) mass.
B) distance.
C) luminosity.
D) size.
E) composition.
B
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Radioactivity Basics: An ? particle is also known as
A. an electron. B. a positron. C. a helium nucleus. D. a high-energy photon.
Some stars vary in brightness. What observing technique is best for observing the details of the changes in brightness?
A) Time-monitoring because we want to track how the brightness changes with time. B) Imaging because an image will show the star getting brighter and dimmer. C) Spectroscopy because changing brightness means changing temperature. D) All of the above are equally useful in detecting variation in brightness.
The emission line for a given atom shows spectral features at the ________ location as in its absorption spectrum
Fill in the blank(s) with correct word
Consider a situation where a skater pulls her arms inward, causing her rotation rate to speed up.Angular momentum
a. is definitely conserved. b. is definitely not conserved. c. may or may not be conserved. d. none of the above