Why is the primordial background radiation visible in all directions?
What will be an ideal response?
According to the inflationary universe hypothesis, the entire observable Universe was only about 10^–59 light-second across at an age of about 10^–36 second, there would have been enough time to equalize temperatures before inflation. This explains why the background radiation now has the same temperature in all directions.
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The formation of a galactic central bulge is believed to ____
a. be a slow steady process lasting billions of years b. start after the formation of spiral arms c. be a violent process which adds mass to the central black hole d. begin when the central black hole has reached mature size e. continue throughout the galaxy's life body
Which of the following is about as cheap as coal for base-load electric power today?
A) photovoltaic cells B) solar-thermal generation of electricity C) wind turbines D) All of the above. E) None of the above.
The deviation from the way a compass needle points from the true north direction is the
a. greenhouse effect b. magnetic inclination c. magnetic declination d. magnetic resonance effect e. none of the above
How much energy is stored in the 50-?F capacitor when Va ? Vb = 22V?
a.
0.78 mJ
b.
0.58 mJ
c.
0.68 mJ
d.
0.48 mJ
e.
0.22 mJ