The radius of an approximately spherical nucleus is given by r =

a. r0Z3.
b. r0Z1/3.
c. r0A3.
d. r0A1/3.
e. r0(A ? Z)1/3.

d

Physics & Space Science

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Two neutron stars in a close binary are predicted to spiral into each other and eventually merge because they lose orbital energy through

A) the emission of gravitational waves. B) strong x-ray emission of their accretion disks. C) friction as they orbit through the gas of a surrounding accretion disk. D) the exchange of mass from one to the other.

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In quantum tunneling, electrons and other quantum particles can tunnel through a region of space that would be forbidden to them if they were classical particles

Indicate whether the statement is true or false

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Physics & Space Science

The Maxwell velocity distribution indicates that

a.the total translational kinetic energy of all of the molecules in a sample of an ideal gas is (3/2)(kT)(V). b.the mean velocity of the molecules in a sample of an ideal gas in any one direction is zero. c.molecules of an ideal gas move with the same velocity at a given temperature regardless of molecular mass. d.it is impossible to know the mean velocity of the molecules in the sample.

e. the energy of a molecule of an ideal gas depends more on its position than on its velocity.

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Physics & Space Science

LC Circuits: A series circuit contains an 80-?F capacitor, a 0.020-H inductor, and a switch. The resistance of the circuit is negligible. Initially, the switch is open, the capacitor voltage is 50 V, and the current in the inductor is zero. At time t = 0 s, the switch is closed. When the current in the circuit is 1.5 A, what is the charge on the capacitor?

A. 2000 µC B. 2500 µC C. 3000 µC D. 3500 µC E. 4000 µC

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Physics & Space Science