Photon Energy: At what rate are photons emitted by a 50.0-W sodium vapor lamp if it is producing monochromatic light of wavelength 589 nm? (c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s)
What will be an ideal response?
1.48 × 1020 photons per second
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Why does the burning of fossil fuels increase the greenhouse effect on Earth?
A) Burning depletes the amount of ozone, thereby warming the planet. B) Burning fuel warms the planet. C) Burning produces infrared light, which is then trapped by existing greenhouse gases. D) Burning releases carbon dioxide into the atmosphere. E) All of the above are true.
Which of these statements is correct?
a. Like charges repel each other; unlike charges attract each other. b. Like charges attract each other; unlike charges repel each other. c. All charges attract each other. d. All charges repel each other. e. Two electrons, or two protons, will repel each other because they have like masses.
While luminous enough to be seen with the naked eye, Supernova 1987A was, in fact, in our companion galaxy, the Large Magellanic Cloud
Indicate whether the statement is true or false
Buoyancy: A piece of wood is floating in a bathtub. A second piece of wood sits on top of the first piece, and does not touch the water. If the top piece is taken off and placed in the water, what happens to the water level in the tub?
A. It goes up. B. It goes down. C. It does not change. D. It cannot be determined without knowing the volumes of the two pieces of wood.