If the radiant energy from the Sun comes in as a plane EM wave of intensity 1340 W/m2, calculate the peak values of E and B. (µ0 = 4p × 10^-7 T×m/A)
a. 1010 V/m, 3.0 × 10^-4 T
c. 330 V/m, 3.0 × 10^-4 T
b. 330 V/m, 3.35 × 10^-6 T
d. 1010 V/m, 3.35 × 10^-6 T
D
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The astrology practiced by those who cast predictive horoscopes can be tested by
A) comparing how often the predictions come true to what would be expected by pure chance. B) asking astrologers if it works. C) polling people to find out what percentage believe their horoscopes to be accurate. D) counting how many times the predictions come true.
An ac power generator produces 50 A (rms) at 3600 V. The voltage is stepped up to 100,000 V by an ideal transformer and the energy is transmitted through a long distance power line which has a resistance of 100 ohms. What percentage of the power delivered by the generator is dissipated as heat in the long-distance power line?
What will be an ideal response?
Higher energy photons have
A) greater speed. B) longer wavelengths. C) higher frequency. D) All of the above. E) None of the above.
Weight and g: ?MassRadiusOrbital radiusOrbital periodMoon A4.0 × 1020 kgunknown2.0 × 108 m4.0 × 106 sMoon B1.5 × 1020 kg2.0 × 105 m3.0 × 108 munknownMithra is an unknown planet that has two airless moons, A and B, in circular orbits around it. The table summarizes the hypothetical data about these moons. If you dropped a laser at the surface of Moon B, at what rate would it accelerate toward the ground? (G = 6.67 × 10-11 N ? m2/kg2)
A. 0.10 m/s2 B. 0.15 m/s2 C. 0.20 m/s2 D. 0.25 m/s2 E. 0.30 m/s2