What is the greatest magnitude of the orbital angular momentum L for an electron in a state with principal quantum number n = 5?
A) 4.47
B) 4.90
C) 5
D) 5.48
A
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A thin sheet of plastic (n = 1.60) is inserted between two panes of glass to reduce infrared (? = 700 nm) losses. What thickness (in nm) is necessary to produce constructive interference in the reflected infrared radiation?
a. 218 b. 109 c. 55 d. 318 e. 443
A block attached to an ideal spring of force constant (spring constant) 15 N/m executes simple harmonic motion on a frictionless horizontal surface
At time t = 0 s, the block has a displacement of -0.90 m, a velocity of -0.80 m/s, and an acceleration of +2.9 m/s2 . The mass of the block is closest to A) 2.3 kg B) 2.6 kg C) 4.7 kg D) 9.4 kg
The planet Neptune is blue in color. How would you expect the spectrum of visible light from Neptune to be different from the visible-light spectrum of the Sun?
A) The two spectra would have similar shapes, except Neptune's spectrum would be missing a big chunk of the red light that is present in the Sun's spectrum. B) The two spectra would have similar shapes, except Neptune's spectrum would be missing a big chunk of the blue light that is present in the Sun's spectrum. C) Neptune's spectrum would peak at a much longer wavelength than the Sun's spectrum. D) There is no way to predict the answer to this question, since planets and stars are made of such different things.
A 2.0-m wire carries a current of 15 A directed along the positive x axis in a region where the magnetic field is uniform and given by B = mT. What is the resulting magnetic force on the wire?
A.
B.
C.
D.
E.