Light of wavelength 6.9 × 10^?7 m has an energy of: (h = 6.63 × 10^?34 J?s, c = 3.00 × 10^8 m/s)
a. 2.9E–19 J
b. 9.6E–20 J
c. 3.1E–19 J
d. 4.3E–20 J
e. 3.2E–20 J
a
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The buildup of thermal energy in a collapsing gas cloud leads to thermal pressure that can halt the gravitational collapse. What must happen for the gravitational collapse to continue?
A) The cloud must radiate away some of its thermal energy. B) The cloud must gain mass. C) The cloud must have a very strong magnetic field. D) The cloud must get a push from the radiation of nearby hot, young stars.
The slow, 25,800-year rotation of Earth's axis is called ______________
Fill in the blank(s) with correct word
Determine the potential difference, VA ? VB, in the circuit segment shown below when I = 2.0 mA and Q = 50 ?C
a.
?40 V
b.
+40 V
c.
+20 V
d.
?20 V
e.
?10 V
Two spaceships are traveling through space at 0.6c relative to the Earth. If the ships are headed directly toward each other, what is their approach velocity, as measured by a person on either craft?
A) 1.2c B) c C) 0.6c D) 0 E) none of the above