Which of the following best describes the size and distance relationship of our Sun and the nearest star?
A) A tennis ball here, another on the Moon
B) Two beach balls separated by 100 city blocks
C) Two grains of sand separated by 100 light-years
D) Two golf balls separated by 300 kilometers
E) Two baseballs separated by 100 yards
D
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The formation of the Red Sea as Africa pulls apart from the Arabian peninsula is an example of what geological feature?
a. subduction zone b. midocean rise c. ocean spreading d. rift valley e. volcanic eruption
Metric System: Express the sum 1.00 kg + 1531 g + 2.54 × 104 mg in kilograms with the correct number of significant figures.
A. 2.56 kg B. 27.9 kg C. 2.53 kg D. 2.79 kg
Capacitance is o A/d for
A) all capacitors. B) parallel wires. C) parallel plates. D) concentric cylinders.
In the process of fluorescence, part of the input energy immediately
A) becomes internal energy with the rest as lower-frequency light. B) cascades to excite other atoms in the material. C) is emitted as higher-frequency light and the rest as lower-frequency light. D) excites electrons to metastable states. E) none of the above