A neutral atom has an electron configuration of 1s22s22p63s23p2. How many protons does it have in its nucleus?
A) 5
B) 11
C) 14
D) 20
E) 26
Answer: C
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This figure shows frames from a computer simulation of star formation, starting at the left with a large molecular cloud measuring more than a light-year across. What is happening as time passes (from left to right)?
A) The cloud is fragmenting into smaller pieces that will form stars. B) The cloud is developing hot spots that shine more brightly within it. C) Magnetic fields are forcing the gas to align in intricate ways along twisted magnetic field lines. D) The cloud has been hit by a shock wave from a nearby stellar explosion, which causes the gas to move violently around.
The lack of large impact craters on the surface of Europa is consistent with
A) active volcanism that is constantly resurfacing the crust B) the surface being covered with an ocean of liquid water C) the crust being so thick and hard that impacts leave no marks on the surface D) a subsurface ocean of water because large impacts will break the thin crust causing water and slushy ice below to flood out and resurface the crust
In addition to the conditions required for any solar eclipse, what must also be true in order for you to observe a total solar eclipse?
A) Earth must be near aphelion in its orbit of the Sun. B) The Moon's umbra must touch the area where you are located. C) Earth must lie completely within the Moon's umbra. D) Earth must lie completely within the Moon's penumbra. E) The Moon's penumbra must touch the area where you are located.
Doppler Effect: What is the frequency does a stationary observer hear when a train approaches her with a speed of 30 m/s. The frequency of the train horn is 0.600 kHz and the speed of sound is 340 m/s.
A. 551 Hz B. 600 Hz C. 653 Hz D. 658 Hz