Two charges of equal magnitude but opposite sign are 10 cm apart. The potential is largest
A. close to the positive charge.
B. halfway between the two charges.
C. close to the negative charge.
D. far away from the two charges.
Answer: A
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The spacing between atoms in KCl crystal is 3.1 × 10^?10 m. At what angle from the surface will a beam of 2.23 × 10^?11-m x-rays be constructively scattered?
a. 30° b. 2.1° c. 0.11° d. 20° e. 64°
Compton Scattering: X-rays with a wavelength of 0.00100 nm are scattered by free electrons at 130° from their original direction. What is the kinetic energy (in keV) of each recoil electron? (melectron = 9.11 × 10-31 kg, c = 3.00 × 108 m/s, 1 eV = 1.60 × 10-19 J, h = 6.626 × 10-34 J ? s)
Fill in the blank(s) with the appropriate word(s).
Standing Sound Waves: Consider a pipe of length L that is open at one end and closed at the other end. What are the wavelengths of the three lowest-pitch tones produced by this pipe?
A. 4L, 2L, L B. 2L, L, L/2 C. 2L, L, 2 L/3 D. 4L, 4L/3, 4L/5
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