A quasar's spectrum is hugely redshifted. What do most astronomers think this large redshift tells us about the quasar?
A) the composition of the quasar
B) the distance to the quasar
C) the size of the quasar's central, supermassive black hole
D) the type of host galaxy in which the quasar resides
B
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A certain molecule has 2.00 eV of rotational energy in the l = 1 state. In the l = 4 state, what would its rotational energy be?
A) 30.0 eV B) 32.0 eV C) 20.0 eV D) 8.00 eV E) 16.0 eV
The carbon in a certain ancient ax-handle is only 1/8--one-eighth--as radioactive as the carbon in living wood. The half-life of 14C is 6000 years. From these facts we can conclude that
A) the ax-handle was made from an unusual type of wood that was less radioactive than normal wood. B) the ax-handle is about 18,000 years old. C) the natural carbon-radioactivity at the time the ax-handle was made was only one-eighth of what it is today. D) the ax-handle is about 12,000 years old. E) the ax-handle is about 48,000 years old.
How can a star's blackbody spectrum be used to determine the temperature of a star?
What will be an ideal response?
Using a resistor and two different value capacitors, which of the following combinations in an RC circuit would give the greatest time constant?
a. the resistor in series with both capacitors in series with each other b. the resistor in series with both capacitors in parallel with each other c. the resistor in series with the larger value capacitor d. the resistor in series with the lower value capacitor