When light travels from air into water, what happens to the speed of the wave?
A. Nothing, the speed of light is always constant.
B. It depends on the angle of the light.
C. The speed increases.
D. The speed decreases.
Ans: D. The speed decreases.
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A 120. mH inductor is in series with a 20. ? resistor and a variable capacitor (0.110 ?F to 0.400 ?F)
(a) What is the range of resonant frequencies possible? (b) Connected to a 24. volt rms source, what current flows at resonance?
In the late 1800s, Kelvin and Helmholtz suggested that the Sun stayed hot because of gravitational contraction. What was the major drawback to this idea?
A) It predicted that the Sun could shine for about 25 million years, but geologists had already found that Earth is much older than this. B) It predicted that the Sun would shrink noticeably as we watched it, but the Sun appears to be stable in size. C) It is physically impossible to generate heat simply by making a star shrink in size. D) It predicted that Earth would also shrink in size with time, which would make it impossible to have stable geology on our planet.
Four equal +6.00-?C point charges are placed at the corners of a square 2.00 m on each side. (k = 1/4??0 = 8.99 × 109 N • m2/C2)
(a) What is the electric potential (relative to infinity) due to these charges at the center of this square? (b) What is the magnitude of the electric field due to these charges at the center of the square?
The electrons are quantized in an atom. That means
A. the electrons are in bulk. B. the quantity of electrons keeps changing. C. the electrons can stay only in specific orbits. D. All of these choices are correct.