The Sun appears to be red as it sets because:
1.Air absorbs red light less than other frequencies (i.e., acts like a red filter).
2.The sunlight has a red-shift when you're moving fastest away from it.
3.The Sun cools down to 5000 K each evening.
4.Light is refracted as it enters the atmosphere.
5.The Sun dies in a glorious fireball each evening and is reborn each morning.
6.None of the above.
6
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The probability of finding a particle at any location in the box depends most directly on:
a. the square of the standing wave frequency. b. the square of the standing wave. c. the speed of the wave motion. d. the square of the standing wave amplitude. e. the standing wave amplitude.
While gravity is always attractive, electromagnetic forces are always repulsive
Indicate whether the statement is true or false
When a boxer is moving away from a punch, the force experienced is reduced because
A) momentum transfer is reduced. B) the time of contact is increased. C) the force is less effective. D) all of the above
The Chandrasekhar limit tells us that
a. accretion disks can grow hot through friction. b. neutron stars of more than 3 solar masses are not stable. c. white dwarfs more massive than 1.4 solar masses are not stable. d. stars cannot travel through space too fast e. stars with a mass less than 0.5 solar masses will not go through helium flash.