In state n = 1, the energy of the hydrogen atom is -13.58 eV. What is its energy in state n = 2?

A) -13.58 eV
B) -6.79 eV
C) -4.53 eV
D) -3.40 eV
E) -1.51 eV


D

Physics & Space Science

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A 4.0-kg mass is placed at (3.0, 4.0) m, and a 7.0-kg mass is placed at (3.0, -4.0) m. What is the moment of inertia of this system of masses about the x axis?

a. 275 kg•m2
b. 90 kg•m2
c. 176 kg•m2
d. 99 kg•m2

Physics & Space Science

If two parallel, conducting plates have equal positive charge, the electric field lines will:

a. leave one plate and go straight to the other plate. b. leave both plates and go to infinity. c. enter both plates from infinity. d. none of the above.

Physics & Space Science

The conversion of mass to energy of other forms via nuclear fission is

A) less than 1%. B) about 10%. C) about 20%. D) about 30%. E) more than 30%.

Physics & Space Science

In each of the following situations, point charge q moves in a uniform magnetic field B. The strength of the magnetic field is indicated by the density of field lines. In each situation, the initial speed v of the charge is the same. For which situation(s) will the charge q travel the longest distance in a certain time T?

1.1 2.2 3.3 4.4 5.5 6.1 & 3 7.2 & 4 8.1, 2, 3 & 4 9.1, 2, 3, 4 & 5 10.Cannot be determined

Physics & Space Science