Plutonium has a half life of 2.4 × 104 years. How long does it take for 99.0% of the plutonium to decay?
A) 1.6 × 102 y
B) 1.6 × 103 y
C) 1.6 × 104 y
D) 1.6 × 105 y
E) 1.6 × 106 y
D
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In our solar system, Jovian planets are
A) large, made mostly of gases and liquids with low densities, and found far from the Sun B) small, made of pure rock with high densities, and found close to the Sun C) large, made of pure gases with low densities, and found far from the Sun D) small, made mostly of rock and iron with high densities, and found close to the Sun
Which of the following is an "irreversible" process?
A) A block of wood sliding to a stop along a tabletop. B) A perfectly elastic ball that falls and rebounds from the floor back to its initial height. C) Both of the above. D) Neither of the above.
A diatomic molecule is vibrating in the v = 1 quantum state with a frequency of 2.0 × 1013 Hz. What is the energy of vibration?
A) 0.041 eV B) 0.083 eV C) 0.12 eV D) 0.15 eV E) 0.17 eV
A barbell is easier to twist when its weights are
a. close to the axis of rotation b. near the ends of the bar c. heavy d. light e. none of the above