Photon Energy: What frequency of electromagnetic radiation has photons of energy 4.7 × 10-25 J? (h = 6.626 × 10-34 J ? s)
A. 710 kHz
B. 4.7 MHz
C. 710 MHz
D. 1.4 GHz
Answer: C
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Two asteroids have identical masses. However, one asteroid is twice as far from the Sun than the other. According to Newton's Universal Law of Gravitation the force of gravity exerted by the Sun on the more distant asteroid is
A) the same size as the force exerted on the closer asteroid B) one-quarter of the size of the force exerted on the closer asteroid C) twice as large as the force exerted on the closer asteroid D) one-half of the size of the force exerted on the closer asteroid
How many moles of air must escape from a 15.0-m × 9.0-m × 6.0-m room when the temperature is raised from 10.0°C to 20.0°C? Assume the pressure remains unchanged at one atmosphere while the room is heated. (R = 8.31 J/mol/K)
a. 4.9E+3 moles b. 1.2E+3 moles c. 2.2E+2 moles d. 7.9E+2 moles e. 5.0E+3 moles
Two objects attract each other gravitationally. If the distance between their centers doubles, the gravitational force
A. is a half. B. doubles. C. is a fourth. D. quadruples.
If you could watch a time-lapse movie of the interstellar medium over hundreds of millions of years, what would you see?
A) gas that is often moving at high speed, particularly after one or more supernovae, and constantly changing form between molecular clouds, atomic hydrogen, and hot, ionized bubbles and superbubbles B) gas that changes only in very slow and steady ways, so that the movie would in fact be quite boring C) The entire disk of the Milky Way would pulsate in and out as it contracts to form stars and then blows out in supernovae and then contracts to form stars again and so on. D) The movie would alternate back and forth between being very bright when there is a lot of gas and very dark when there is very little gas.