Refraction causes the bottom of a swimming pool to appear
A) farther down than it actually is.
B) closer to the surface than it actually is.
C) neither of these
Answer: B
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The basic function of the electric generator is which of the following conversion processes?
a. alternating current to direct c. low voltage to high or vice versa b. electrical energy to mechanical d. mechanical energy to electrical
Light of wavelength 687 nm passes through a single slit that is 0.75 mm wide. At what distance from the slit should a screen be placed so that the second dark fringe in the diffraction pattern is to be 1.7 mm from the center of the pattern?
A) 1.9 m B) 1.5 m C) 0.93 m D) 1.1 m E) 0.39 m
Why are distant stars redder than nearby stars of the same spectral type?
What will be an ideal response?