Blue light will not eject electrons from a certain metal; however, which one of the following may possibly eject electrons from that metal?
a. red
c. infrared
b. green
d. ultraviolet
D
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Two point charges of +2.0 ?C and -6.0 ?C are located on the x-axis at x = -1.0 cm and x = +2.0 cm respectively
Where should a third charge of +3.0-?C be placed on the +x-axis so that the potential at the origin is equal to zero? (k = 1/4??0 = 8.99 × 109 N ? m2/C2) A) x = 4.0 cm B) x = 1.0 cm C) x = 2.0 cm D) x = 3.0 cm E) x = 5.0 cm
Ptolemy formulated a(n) ____________________ model of the solar system to predict positions of the Sun, Moon, and planets
Fill in the blank(s) with correct word
Photon Energy: A small gas laser of the type used in classrooms may radiate light at a power level of 2.0 mW. If the wavelength of the laser light is 642 nm, how many photons does it emit per second? (c = 3.0 × 108 m/s, h = 6.626 × 10-34 J ? s)
Fill in the blank(s) with the appropriate word(s).
Pulsars are rapidly spinning
A) regular stars like our Sun. B) red giant stars. C) neutron stars. D) white dwarfs. E) supernova.