Monochromatic light (l = 500 nm) is incident on a soap bubble (n = 1.4) that is 500-nm thick. Calculate the change of phase of the light that penetrates the front surface, reflects from the second surface, and emerges through the first surface as an angle between 0° and 360°?
a. 280°
b. 160°
c. 220°
d. 100°
e. 290°
E
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Two identical spheres each carry a charge of -40.0 µC. The spheres are separated by a distance of 2.00 m. What is the electric force between the spheres? (ke = 8.99 × 10^9 N•m2/C2)
a. 43.2 N (attractive) c. 3.60 N (repulsive) b. 14.4 N (repulsive) d. 7.19 N (attractive)
The banded iron formations began to form when
A) carbon dioxide dissolved in seawater. B) varying oxygen levels allowed the precipitation of alternating layers of iron oxide. C) oxide minerals were deposited on the ocean bottom. D) iron from lava flows settled into layered formations.
Lenz's Law: A coil lies flat on a tabletop in a region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the field fades?
A. The induced current flows counterclockwise. B. The induced current flows clockwise. C. There is no induced current in this coil. D. The current flows clockwise initially, and then it flows counterclockwise before stopping.
What is the wavelength of the emitted photon if an electron in the hydrogen atom makes a transition from the ni = 2 to the nf = 1 state?
A) 205.2 nm B) 87.5 nm C) 91.2 nm D) 121.5 nm E) 402.1 nm