That all points on a wave front act as new sources of spherical waves is attributed to:
a. Maxwell. b. Young.
c. Thomas. d. Huygens.
d
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we imagine the history of the universe compressed into one year, with the present as the stroke of midnight at the very end of that year, dinosaurs became extinct
A) about 6 months ago. B) about 3 weeks ago. C) yesterday morning. D) about an hour ago.
Which of the following statements is FALSE?
A: For an observer located in a galaxy all other distant galaxies would appear to move away from his. B: The universe looks the same in all directions; i.e. it is homogeneous and isotropic. C: The universe is expanding. D: In our universe, at earlier times, everything was closer together. E: We are at the center of the universe.
A hunter on level ground fires a bullet at an angle of 10 degrees below the horizontal while simultaneously dropping another bullet from the level of the rifle. Which bullet will hit the ground first?
A) the one dropped B) the one fired C) both hit at the same time.
If light of wavelength 700 nm is sent through a slit of width of 5.0 ?m, at what angle from the central maximum is the 4th order minimum?
A) 90° B) 34° C) 39° D) 8° E) 68°