Rainbows are caused by sunlight being
A) dispersed.
B) dispersed, refracted, & reflected.
C) refracted.
D) reflected.
E) refracted & reflected but not dispersed.
B
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Does the Moon orbit the Sun?
A. Yes. It goes in a circle about the Sun. B. No. It orbits Earth. C. Yes, but it also orbits Earth. D. No, but it would if Earth were not present.
A crying baby emits sound with an intensity of 8.0 × 10-8 W/m2
Calculate a reasonable estimate for the intensity level from a set of quintuplets (five babies), all crying simultaneously at the same place? The lowest detectable intensity is 1.0 × 10-12 W/m2. A) 79 dB B) 69 dB C) 56 dB D) 49 dB E) 36 dB
Refer to the race described above. According to the spectators watching in the stands, what happens?
A) The light beam wins the race, but barely—it is going 1 percent of the speed of light faster than Ben. B) The light beam instantly finishes the race, before Ben even has a chance to start. C) The light beam wins the race by a large margin because it is going faster than Ben by the full speed of light. D) Ben beats the light beam to the finish line, becoming a hero.
Capacitor #1 has parallel plates of length L and width W, plate separation d, and is filled with dielectric with constant K.Capacitor #2 has parallel plates of length 2L and width 2W, plate separation 2d, and is filled with dielectric with constant 2k. If a voltage V is applied to capacitor #1 and a voltage 2V is applied to capacitor #2, which capacitor stores more energy and by what factor?
a. Capacitor #2 by a factor of 8 b. Capacitor #2 by a factor of 16 c. Capacitor #1 by a factor of 4 d. Both capacitors store the same energy.