In a hydrogen atom, the electron makes a transition from the n = 8 to the n = 3 state. What is the wavelength of the emitted photon?
A) 9.54 × 10-7 m
B) 1.13 × 10-6 m
C) 3.12 × 10-7 m
D) 4.52 × 10-6 m
E) 6.34 × 10-7 m
A
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The 
He nucleus is unstable. To what will it decay?
A. 
Li + e- +
B. 
Li + e- +
C. Li + e- + ?
D. Li + e-
E. 
H + e+ + ?
A 3.0-kg object moves to the right at 4.0 m/s. It collides head-on with a 6.0-kg object moving to the left at 2.0 m/s. Which statement is correct?
A) The total momentum both before and after the collision is 24 kg ? m/s. B) The total momentum before the collision is 24 kg ? m/s, and after the collision is 0 kg ? m/s. C) The total momentum before the collision is 0 kg ? m/s, and after the collision is 24 kg ? m/s. D) The total momentum both before and after the collision is zero. E) None of the above is true.
The principle of equivalence states that
A) the laws of physics are the same in all inertial frames of reference. B) the speed of light is the same in any frame of reference. C) clocks that move relative to one another keep time at different rates. D) the length of an object depends on its speed relative to a given observer. E) all physical experiments conducted in a uniform gravitational field and in an accelerated frame of reference give identical results.
The ratio of the density of a neutron (r = r0A1/3) to the density of a classical electron (re = ke2/mec2 = 2.8 × 10^-15 m) is
a. 4.3 × 10^2 b. 2.3 × 10^4 c. 1.4 × 10^2 d. 6.9 × 10^-3 e. 4.3 × 10^3