Diffraction Gratings: A beam of light of wavelength 600 nm is incident normally on a diffraction grating with a spacing between slits of 1.70 × 10-4 cm. At what angle away from the centerline does a first-order maximum occur?
A. 10.5°
B. 12.1°
C. 16.4°
D. 18.2°
E. 20.7°
Answer: E
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The first intergalactic spaceship is headed toward the Magellanic Clouds at a speed of 0.8c. The spaceship is 1000 m long. Clocks at the front and the rear of the spaceship both read 3:00 P.M. Can it be 3:00 P.M. simultaneously at the front and the back of the spaceship?
A.
, where ?x is the length of the spaceship.B.
C.
D.
E.
A sketch of the Earth with its north and south poles and equator is shown. The zenith is located in the sky over your head if you are at
?
a.
Earth's equator.
b.
Earth's north pole.
c.
Earth's south pole.
d.
any of these.
A car is moving along a straight highway and accelerates at a constant rate while going from point A to point B. If the acceleration is positive, increasing the speed of the car, where does the position where the instantaneous speed equals the average speed occur for the interval from A to B?
a. midway between A and B c. closer to B than to A b. closer to A than to B d. Any of the answers could be correct depending on the original speed.
The body which wiped out the dinosaurs was about:
A) as big as our Moon. B) as big as one of Mars' moons. C) a few hundred meters across. D) as big as a 747. E) as big as an SUV.