A possible spike in the number of impacts in the inner solar system about 4 billion years ago may have mostly likely been due to
A) the passage of another star close to the Sun
B) planetary migration caused by the shifting of the orbits of the Jovian planets
C) the giant collision that formed the Moon
D) the breakup a planet to form the asteroid belt
B
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If you rub an inflated balloon against your hair and place the balloon against the wall it will stick to the wall, illustrating
A) Coulomb's law. B) conduction and insulation. C) charge polarization. D) voltage.
For a specific element, photons of how many different energies could be absorbed by electrons to jump from the n = 1 to n = 5 level?
a. 20 b. 10 c. 6 d. 1 e. 4
Which of these will always produce a magnetic field?
A. Another magnetic field B. A moving charge C. A negative charge at rest D. A positive charge at rest
When we look at an object that is 1,000 light-years away, we see it ________
A) as it was 1,000 light-years ago B) looking just the same as our ancestors would have seen it 1,000 years ago C) as it is right now, but it appears 1,000 times dimmer D) as it was 1,000 years ago