An electron is confined in a one-dimensional box (an infinite well)
Two adjacent allowed energies of the electron are 1.068 × 10-18 J and 1.352 × 10-18 J. What is the length of the box? (h = 6.626 × 10-34 J ? s, mel = 9.11 × 10-31 kg)
A) 1.9 nm
B) 0.93 nm
C) 1.1 nm
D) 2.3 nm
A
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Blue light differs from red light in that
a. blue light has a higher energy than red light. b. blue light has a lower energy than red light. c. blue light has a shorter wavelength than red light. d. blue light has a longer wavelength than red light. e. More than one of the above.
A 0.40-kg mass attached to the end of a string swings in a vertical circle having a radius of 1.8 m. At an instant when the string makes an angle of 40 degrees below the horizontal, the speed of the mass is 5.0 m/s. What is the magnitude of the tension in the string at this instant?
a. 9.5 N b. 3.0 N c. 8.1 N d. 5.6 N e. 4.7 N
Spheres of Charge: A spherical conductor of radius 2.0 mm carries a charge of 7.1 nC. What is the magnitude of the electrical field at 6.0 mm from the center of the sphere? (k = 1/4??0 = 9.0 × 109 N ? m2/C2)
A. 25 × 106 N/C B. 89 × 106 N/C C. 1.8 × 106 N/C D. 780 × 106 N/C E. 0.89 × 106 N/C
A mid-ocean ridge is formed at the boundary of two plates
a. that are separating from one another. b. that are sliding horizontally past one another. c. where one is pushing over the top of the other. d. that are basically at rest.