Which of the following kinds of stars is most dense?
a. a supergiant star
b. a main sequence star
c. a giant star
d. a white dwarf
e. the sun
D
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Diffraction Gratings: Light of the same wavelength passes through two diffraction gratings. One grating has 4000 lines/cm, and the other one has 6000 lines/cm. Which grating will spread the light through a larger angle in the first-order pattern?
A. the 4000-line grating B. the 6000-line grating C. Both gratings spread the light the same.
Daylight and nighttime hours are equal
A) during the summer and winter solstices. B) during the equinoxes. C) in mid-June and mid-December. D) during the equinoxes—mid-September and mid-March.
When one kilogram of ice at 0°C is converted to the same amount of water at 0°C by adding heat, the change in entropy is ________ (positive, negative, zero).
Fill in the blank(s) with the appropriate word(s).
The intensity of solar radiation near the earth is 1.4 × 103 W/m2. What force is exerted by solar radiation impinging normally on a 5.0 m2 perfectly reflecting panel of an artificial satellite orbiting the earth?
A) 1.4 × 104 N B) 9.4 × 10-5 N C) 1.4 × 10-4 N D) 2.3 × 10-5 N E) 4.7 × 10-5 N