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

Physics & Space Science

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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.

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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

Physics & Space Science

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

Physics & Space Science

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

Physics & Space Science