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 increasing the amount a greenhouse gas increase the temperature of a planet?
A) Greenhouse gases absorb visible light. B) Greenhouse gases emit visible light. C) Greenhouse gases absorb infrared light. D) Greenhouse gases emit infrared light.
A piece of soft wood floats in water with half of its volume submerged. If it is placed in mercury which has a density about 13.6 times that of water, it will float ________ (higher, lower, the same) compared with floating in water.
Fill in the blank(s) with the appropriate word(s).
A 120-V rms voltage at 2000 Hz is applied to a 6.0-mH inductor, a 2.0-?F capacitor and a 200-? resistor. What is the rms value of the current in this circuit?
A) 1.5 A B) 0.48 A C) 2.5 A D) 3.5 A E) 0.59 A
Collectively, electrons, muons, and neutrinos are called:
A) hadrons. B) baryons. C) photons. D) leptons. E) pions.