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

Physics & Space Science

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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

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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

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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.

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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.

(+1.2 ) N

B.
(?1.2 ) N

C.
(?1.5 ) N

D.
(+1.5 ) N

E.
(+0.90 ) N

Physics & Space Science