A beam of X-rays of different frequencies is reflected at 10 degrees off a crystal of interatomic spacing 0.2 nm. Which X-ray wavelength is preferentially reflected?
a. 0.0943 nm
b. 0.139 nm
c. 0.069 5 nm
d. 1.02 × 10^-10 m
e. 3.47 × 10^-11 m
C
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What is the resistance of the combination of resistors?
A. 4.0 
B. 12
C. 13
D. 14
E. 15
When charges qa, qb, and qc are placed respectively at the corners a, b, and c of a right triangle, the potential at the midpoint of the hypotenuse is 24 V. When the charge qa is removed, the potential at the midpoint becomes 17 V. When, instead, the charge qb is removed (qa and qc both in place), the potential at the midpoint becomes 13 V. What is the potential at the midpoint if both charges qa
and qc are removed? a. 11 V b. 7.0 V c. 6.0 V d. 18 V e. 17 V
The visible color of electromagnetic radiation that has the shortest wavelength is
A) red. B) orange. C) green. D) blue. E) violet.
The pitch of a sound is determined primarily by its
A. duration. B. amplitude. C. speed. D. frequency.