Quasars are most common in the redshift range of _____
A) 0.6 to 1.5
B) 2 to 2.7
C) 3.2 to 4
D) 5 to 5.8
B
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How do astronomers measure the mass of a supermassive blackhole?
a) by comparing its apparent magnitude to its absolute brightness b) by comparing its X-ray luminosity to its radio luminosity c) using the formula E = mc2 d) by measuring the speed at which stars move in its vicinity e) by measuring its parallax
Why do you think you were asked to complete more cycles in Procedure 1, Step 3, if the total time was less than 10 seconds for 10 cycles?
The type of heat transfer that occurs between warm food and the air in the room is principally
A) convective. B) conductive. C) radiative. D) countercurrent. E) evaporation.
If a negative charge is placed inside a hollow isolated conductor that is originally neutral and the charge does not touch that conductor at any time:
a. both the inner and outer surfaces will become negative. b. both the inner and outer surfaces will remain neutral. c. the outside surface of the conductor will become positively charged. d. the inside surface of the conductor will become positively charged.