When a blinking light source moves relative to you, the speed of the light
A) changes but the frequency of blinks remains constant.
B) remains constant but the frequency of blinks can change.
C) stays the same, as does the blinking frequency.
Answer: B
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Impedance: What resistance must be put in series with a 30-mH inductor at 4000 Hz to have a total impedance of 8.0 × 104 ??
A. 30 × 104 ? B. 5.0 × 104 ? C. 6.0 × 104 ? D. 7.0 × 104 ? E. 8.0 × 104 ?
Which approach is currently proving to be the most promising way of determining how life on Earth originated?
A) studies of Martian meteorites B) studies of organisms living around deep-sea ocean vents C) studies of the fossil record D) laboratory simulations of conditions present on the early Earth
A Young's double-slit experiment is performed in air and then the apparatus is submerged in water. What happens to the fringe separation, and what can be used to explain the change, if any?
a. The separation stays the as it is the same experiment independent of the medium. b. The separation decreases because the frequency of the light decreases in the water. c. The separation increases because the wavelength of the light increases in the water. d. The separation decreases because the wavelength of the light decreases in the water.
Stars in the process of forming are called
a. giant planets. b. brown dwarfs. c. red supergiants. d. protostars.