Light being amplified by stimulated emission of radiation is the principle of the photoelectric effect
Indicate whether the statement is true or false
F
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Consider a child who is swinging. As she reaches the lowest point in her swing:
a. the tension in the rope is equal to her weight. b. the tension in the rope is equal to her mass times her acceleration. c. her acceleration is downward at 9.8 m/s2. d. none of the above.
If a mile of 24-gauge copper wire has a resistance of 0.14 kW and the resistivity of copper is 1.7 × 10^-8 W × m, what is the diameter of the wire? (1 mile = 1.6 km)
a. 0.40 mm b. 0.50 mm c. 0.63 mm d. 0.80 mm e. 0.25 mm
The spectrum of a(n) ____________________ consists of a continuous spectrum and a few highly redshifted emission lines of due to hydrogen
Fill in the blank(s) with correct word
One of the lines of Hydrogen has a wavelength of 121.6 nm. If a cloud of Hydrogen gas is moving TOWARDS us at 200km/s, what will we detect?
a) An emission line in the cloud's spectrum with a wavelength shorter than 121.6 nm. b) An emission line in the cloud's spectrum with a wavelength longer than 121.6 nm. c) An emission line in the cloud's spectrum with a wavelength of exactly 121.6 nm. d) This cloud will not emit a spectrum at all. e) A continuous spectrum with an absorption line at exactly 121.6 nm.