A meterstick is shot from a meterstick projector at a speed of 0.90c. How long will it be relative to an observer's frame of reference?
a. 2.3 m
b. 0.91 m
c. 1.0 m
d. 0.44 m
e. 0.81 m
d
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Thin Films: Light in air of wavelength 500 nm illuminates a soap film that has an index of refraction of 1.3 and air on both sides. What is the minimum thickness of this film that will produce cancellation in the reflected light when the light is incident normally on the film?
Fill in the blank(s) with the appropriate word(s).
A 120-V rms voltage at 1000 Hz is applied to a resistor and an inductor in series. If the impedance of this circuit is 110 ?, what is the maximum value of the current?
A) 1.54 A B) 1.09 A C) 1.84 A D) 1.04 A E) None of the other answers is correct.
To save the most energy when you leave your cool house for an hour or so on a hot day, you should turn the temperature setting on the air conditioner
A) down. B) up. C) off. D) to room temperature.
When two elements come together to form a compound, which element is named first within the name of the compound?
A) The element coming first in the English alphabet. B) The element with the greater atomic mass. C) The element with the greater atomic number. D) The element toward the left hand side of the periodic table.