What is the frequency of monochromatic light where the photon energy is 6.5 × 10^-19 J? (h = 6.63 × 10^-34 J×s)
a. 2.2 × 10^14 Hz
c. 4.4 × 10^14 Hz
b. 9.8 × 10^14 Hz
d. 8.3 × 10^14 Hz
B
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Reactance: What is the reactance of a 20-mH inductor at a frequency of 60 Hz?
A. 7.5 ? B. 0.13 ? C. 1.2 ? D. 1.2 m? E. 7.5 m?
What do astronomer's mean when they say that Earth is not in a special spot?
A. All space is expanding so Hubble's law would apply around all galaxies. B. The Big Bang explosion sent all material blasting away from the Earth. C. Hubble measured the expansion law from the Moon, not from the Earth. D. Hubble's law applies to some galaxies but not to others, so many planets besides Earth have their own Hubble's law. E. The Sun is at the center of the universe, but the Earth is not.
If y = 0.02 sin (30x? 400t) (SI units), the velocity of the wave is
A. 3/40 m/s. B. 40/3 m/s. C. 60?/400 m/s. D. 400/60? m/s. E. 400 m/s.
The Julian calendar, which has 365 days and a leap day every 4 years, was no longer used in Europe after 1582 because
a. it is slightly inaccurate and after 1600 years of use caused large problems. b. leap years are rough on people born on February 29. c. people realized that the Roman calendar is better. d. it had 13 months, which is unlucky. e. none of the above; we still use it.