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.
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.
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
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.