Which light-emitting process is characterized by an afterglow?
A) incandescence.
B) fluorescence.
C) phosphorescence.
D) resonance.
E) none of the above
Answer: C
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Stars at different distances from the galactic center revolve with different periods, an effect called _______________ rotation
Fill in the blank(s) with correct word
If sunlight broke up water molecules in Venus's atmosphere, would the hydrogen atoms es-cape into outer space? Note that Venus's temperature is 740 K. Recall that gas eventually will escape if the average velocity of its atoms is greater than 1/6 times the escape velocity of the planet. The escape velocity of Venus is 10 km/s.
a. No, the average velocity of hydrogen atoms would be 0.8 km/s. b. No, the average velocity of hydrogen atoms would be 3.9 km/s. c. Yes, the average velocity of hydrogen atoms would be 3.9 km/s. d. Yes, the average velocity of hydrogen atoms would be 25 km/s. e. No, the average velocity of hydrogen atoms would be 25 km/s.
150 g of liquid nitrogen at its boiling point of 77.0 K is stirred into a beaker containing 510 g of 18.0°C water. If the nitrogen leaves the solution as soon as it turns to gas, how much water freezes? The heat of vaporization of nitrogen is 48.0 cal/g and that of water is 80.0 cal/g
a. none b. 21 g c. 42 g d. 11 g e. 63 g
A projectile is launched from ground level at an angle of 70.0° above horizontal with a speed of 50.0 m/s. If the projectile is moving over level ground, how far way from the launch position does it contact the ground?
A) 164 m B) 54.2 m C) 203 m D) 102 m E) 12.4 m