Twelve hours of daytime and twelve hours of nighttime occur at every location on Earth whenever the Sun reaches the
a. north or south celestial pole.
b. celestial prime meridian.
c. vernal or autumnal equinox.
d. ecliptic.
c
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Diffraction Gratings: Monochromatic light of wavelength 500 nm is incident normally on a diffraction grating. If the third-order maximum of the diffraction pattern is observed at 32° from the centerline, what is the distance between the slits of the grating?
A. 0.93 ?m B. 1.4 ?m C. 2.8 ?m D. 8.5 ?m
Which one of the following is an example of a blackbody that you see in everyday life?
A. a stove burner B. a fluorescent light C. a laser pointer D. a neon light
In which of these processes is an element transformed into a completely different element?
A) alpha decay B) beta decay C) both of these D) none of the above
Water pressure at the bottom of a lake depends on the
A) weight of water in the lake. B) surface area of the lake. C) depth of the lake. D) all of the above