A ray of light passes from one material into a material with a higher index of refraction. Which quantity remains unchanged?
a. The light's speed
b. The light's wavelength
c. The light ray's angle with the normal
d. The photon energy
d
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For a BCC crystal, which of the following x-ray (hkl) diffraction peaks is not present?
(a) (200) (b) (110) (c) (130) (d) (111)
If you went to the moon, you would find that
A) your mass would be reduced, but not your weight. B) it really is made of blue cheese. C) your weight would be increased. D) both your weight and your mass would be reduced. E) your weight would be reduced, but not your mass.
Work-Energy Theorem: A sled having a certain initial speed on a horizontal surface comes to rest after traveling 10 m. If the coefficient of kinetic friction between the object and the surface is 0.20, what was the initial speed of the object?
A. 9.8 m/s B. 6.3 m/s C. 3.6 m/s D. 7.2 m/s E. 8.9 m/s
A point charge Q is placed on the x axis at the origin. An identical point charge is placed on the x axis at x = ?1.0 m and another at x = +1.0 m. If Q = 40 ?C, what is the magnitude of the electrostatic force on the charge at x = +1.0 m?
a. 29 N b. 14 N c. 11 N d. 18 N e. 7.0 N