The rings of Neptune
A) were confirmed by the Voyager 2 in 1989.
B) number five, with three narrow, two more diffuse.
C) all lie within Neptune's Roche Limit.
D) often appear as clumpy ring arcs, rather than complete and symmetrical.
E) All of these are correct.
E
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Photon Energy: A helium-neon laser emits light at 632.8 nm. If the laser emits 1.82 × 10-17 photons/second, what is its power output in mW? (c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s)
A. 57.2 mW B. 28.6 mW C. 37.2 mW D. 45.7 mW
Which statement is true?
A) If we could build a spaceship capable of traveling at a speed near the speed of light, passengers on the ship could make a journey to a star that is 500 light-years away within their lifetimes. B) If we could build a spaceship capable of traveling at a speed near the speed of light, we could send a ship to a star that is 500 light-years away and it would return just a few years after we launched it. C) Thanks to effects of special relativity, we could build a spaceship that could go close to the speed of light with much less fuel than we would have guessed from Newton's laws of motion. D) Because special relativity tells us that we cannot reach or exceed the speed of light, it means that distant stars will never be within our reach because the time required to reach them will always be quite long, even with fast spaceships.
A Geiger counter placed 1 meter from a point source of radiation registers 100 counts per minute. If the Geiger counter is moved closer, half-way to the source, the counting rate will be
A) 25 counts/min. B) 50 counts/min. C) 100 counts/min. D) 200 counts/min. E) 400 counts/min.
Describe the process of crystallization.
What will be an ideal response?