How thick are Saturn's rings from top to bottom?
A) a few million kilometers
B) a few tens of thousands of kilometers
C) a few hundred kilometers
D) a few kilometers
E) a few tens of meters
E
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How fast would you have to drive in order to see a red light as green? Assume 
= 630 nm for red and 
= 530 nm for green
A. 
B. 
C. 
D. 
An atom of sodium has an atomic number of 11 and a mass of 23 . How many neutrons does it have?
a. 11 b. 12 c. 23 d. 34 e. 35
A muon is an unstable particle that has an average lifetime of 1.52 × 10-6 s
This is the time interval between its creation in a nuclear process and its extinction into decay products, as measured in a frame of reference at rest with respect to the muon. An "average" muon is observed by a scientist on Earth to travel 342 m in its lifetime. What is the speed of the muon relative to Earth? A) 0.821c B) 0.681c C) 0.601c D) 0.551c E) 0.335c
Gamma rays are photons with very high energy. What is the wavelength of a gamma-ray photon with energy 7.7 × 10-13 J? (c = 3.0 × 108 m/s, h = 6.626 × 10-34 J ? s)
A) 3.1 × 10-13 m B) 3.5 × 10-13 m C) 3.9 × 10-13 m D) 2.6 × 10-13 m