For a specific element, photons of how many different energies could be emitted by electrons in the n = 2 level as they return to the n = 1 level?
a. 3
b. 4
c. 2
d. 1
d
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The redshifts of Galaxy A and Galaxy B have been measured. The redshift of Galaxy B is twice that of Galaxy A. Which galaxy is farther away and by what factor?
A. There is not enough information to determine which is farther away. B. Galaxy A is twice the distance of Galaxy B. C. Galaxy B is four times more distant than Galaxy A. D. Galaxy B is twice the distance of Galaxy A.
In special relativity, we learned that people in different reference frames will measure time differently. According to general relativity, why does this happen?
A) People in different reference frames experience different realities. B) It is an illusion, and time really is the same for everyone. C) They have different worldlines. D) They are experiencing the same spacetime reality, but from different perspectives.
How does the theory of planetary migration in disks possibly account for the highly eccentric orbits discovered for some extrasolar planets?
A) A migrating planet would create waves in the planet forming disk, which would in turn lead to the formation of planets on highly elliptical orbits. B) When migrating planets pass close enough for a gravitational encounter, one may be flung from the system while the other is shifted to a highly elliptical orbit. C) When migrating planets collide, they would move onto more eccentric orbits. D) When a planet migrates onto the surface of the star, the additional stellar mass would disrupt the orbits of the remaining planets.
A 1.20-kg ball is hanging on the end of a rope. The rope makes an angle 25.0° from the vertical when a 15.0 m/s horizontal wind blows. If the wind's force on the rope is negligible, what is the drag force on the ball?
A) 32.3 N B) 24.1 N C) 3.68 N D) 5.49 N E) 11.8 N