An electron (charge -1.6 × 10^-19 C) moves on a path perpendicular to the direction of a uniform electric field of strength 3.0 N/C. How much work is done on the electron as it moves 20 cm?
a. 1.6 × 10^-20 J
c. 4.8 × 10^-20 J
b. -4.8 × 10^-20 J
d. zero
D
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Which of the following is true of redshift?
A) Radiation that comes from great distance has tremendous redshift. B) Radiation from the hot gas of the big bang is calculated to have a redshift of about 10. C) The redshifts of different galaxies imply that these galaxies are moving toward each other. D) The redshifts of the most faint and distant galaxies known to date are about 1100.
How is a luminosity class assigned to a star?
a. by combining the apparent magnitude with the star's parallax b. by measuring the period of variability in the star's apparent magnitude c. by studying the absorption line width in the spectrum of the star d. by observing the angular size of the star's image in a photograph or digital image
At Titan, the lakes are made mostly of liquid
A) metallic hydrogen. B) nitrogen. C) carbon dioxide. D) methane. E) water.
Blue stars are always more luminous than red stars
Indicate whether the statement is true or false