According to Einstein, increasing the brightness of a beam of light without changing its color will increase:
a. the frequency of the photons.
c. the speed of the photons.
b. the energy of each photon.
d. the number of photons.
D
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From 1979 to 1999 Pluto was closer to the sun than
a. Earth. b. Uranus. c. Neptune. d. Saturn. e. Jupiter
Contrast the orbits of comets and asteroids
What will be an ideal response?
Which of the following statements about comets best describes the light we can observe?
A) A comet emits visible light and reflects infrared light. B) A comet emits no light, but reflects visible light. C) A comet emits visible light and infrared light. D) A comet emits infrared light and reflects visible light.
A dinner plate falls vertically to the floor and breaks up into three pieces, which slide horizontally along the floor. Immediately after the impact,
a 200-g piece moves along the +x-axis with a speed of 2.00 m/s, a 235-g piece moves along the +y-axis with a speed of 1.50 m/s. The third piece has a mass of 100 g. What is the speed of the third piece? A) 2.51 m/s B) 2.57 m/s C) 3.50 m/s D) 5.33 m/s E) 6.83 m/s