A light source radiates 60.0 W of single-wavelength sinusoidal light uniformly in all directions. What is the amplitude of the electric field of this light at a distance of 0.400 m from the bulb?
(?0 = 8.85 × 10-12 C2/N ? m2, ?0 = 4? × 10-7 T ? m/A, c = 3.00 × 108 m/s)
A) 162 N/C B) 52.9 N/C C) 212 N/C D) 150 N/C E) 82.1 N/C
D
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a. True b. False Indicate whether the statement is true or false
A black hole can be thought of as
a. a very massive object of finite size. b. a shell of material expanding from a white dwarf. c. a massive body of infinitely small size. d. a burnt out white dwarf.
Energy Conservation With Conservative Forces: A lightweight object and a very heavy object are sliding with equal speeds along a level frictionless surface. They both slide up the same frictionless hill with no air resistance. Which object rises to a greater height?
A. The heavy object, because it has greater initial kinetic energy. B. The light object, because gravity slows it down less. C. The lightweight object, because the force of gravity on it is less. D. The heavy object, because it has more mass to carry it up the hill. E. They both slide to exactly the same height.
According to the "galactic fountain" model, what can create a superbubble emerging into the halo?
A) winds and jets from newly formed protostars B) a supernova occurring in the halo C) multiple supernovae occurring near one another around the same time D) the combined effect of spiral density waves E) molecular clouds expelled from the galactic center