The broad emission lines of Seyfert galaxies imply high gas speeds in the nucleus
a. True
b. False
Indicate whether the statement is true or false
True
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Describe four effects that helped to clear the solar nebula
What will be an ideal response?
In the color wheel shown below, which colors are the warm colors?
A. red, yellow, blue B. orange, green, purple C. green, blue, purple D. yellow, orange, red
The isotope 14C cannot be used in dating old samples of which of the following?
a. charcoal from a fire b. a bronze implement from a cave c. a bone buried in mud d. All of the above can be dated using 14C.
When a hydrogen atom's electron goes from an energy state of n = 2 to n = 1,
a. the radius of the electron's orbit is unchanged. b. the radius of the electron's orbit is increased. c. the radius of the electron's orbit is decreased. d. the radius of the electron's orbit is infinite.