Radioactivity Basics: A radioactive isotope of atomic number Z emits a beta-minus particle, and then the daughter nucleus emits a gamma ray. What is the atomic number of the resulting nucleus after both processes?
A. Z - 1
B. Z + 1
C. Z - 2
D. Z - 3
Answer: B
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A car headlight and an interior dome light use the same voltage, but the headlight consumes much more power because
a. its resistance is lower. b. the current in it is larger. c. it uses energy faster. d. all of the above
When a mass of 0.350 kg is attached to a vertical spring and lowered slowly, the spring stretches a distance d. The mass is now displaced from its equilibrium position and undergoes 100 oscillations in 48.9 s. What is the stretch distance d?
A) 2.35 cm B) 2.97 cm C) 4.71 cm D) 5.94 cm E) 6.28 cm
Points A [at (2, 3) m] and B [at (5, 7) m] are in a region where the electric field is uniform and given by N/C. What is the potential difference VA - VB?
a. 33 V b. 27 V c. 30 V d. 24 V e. 11 V
Harlow Shapley concluded that the Sun was not in the center of the Milky Way Galaxy by
A) looking at the shape of the "milky band" across the sky. B) mapping the distribution of stars in the galaxy. C) mapping the distribution of globular clusters in the galaxy. D) mapping the distribution of gas clouds in the spiral arms. E) looking at other nearby spiral galaxies.