An atom can be excited into a higher energy state by absorbing a photon
Indicate whether the statement is true or false
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A thin, circular disk of radius 30.0 cm is oriented in the yz-plane with its center at the origin
The disk carries a total charge of +3.00 ?C distributed uniformly over its surface. Calculate the magnitude of the electric field due to the disk at the point x = 15.0 cm along the x-axis. (?0 = 8.85 × 10-12 C2/N ? m2) A) 9.95 × 105 N/C B) 4.98 × 105 N/C C) 3.31 × 105 N/C D) 2.49 × 105 N/C E) 1.99 × 105 N/C
A measurement of an electron's speed is 2.0 × 106 m/s and has an uncertainty of 10%. What is the minimum uncertainty in its position? (h = 6.626 × 10-34 J ? s, mel = 9.11 × 10-31 kg)
A) 0.91 nm B) 1.8 nm C) 2.7 nm D) 2.8 nm E) 5.0 nm
The expansion of the universe is due to the
A) motion of galaxies through space B) expansion of space within galaxies C) expansion of stars within galaxies D) expansion of space between galaxies
Optical fibers work because of
a. interference. b. diffraction. c. total internal reflection. d. diffuse reflection. e. polarization.