A proton, which moves perpendicular to a magnetic field of 0.60 T in a circular path of radius 0.080 m, has what speed? (qp = 1.6 × 10^-19 C and mp = 1.67 × 10^-27 kg)
a. 9.2 × 10^6 m/s
c. 9.6 × 10^6 m/s
b. 4.6 × 10^6 m/s
d. 3.4 × 10^6 m/s
B
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One of the harmonics of a column of air open at one end and closed at the other has a frequency of 448 Hz and the next higher harmonic has a frequency of 576 Hz. How long is the air column? The speed of sound in air is 343 m/s
A) 1.34 m B) 0.670 m C) 0.335 m D) 1.00 m E) 2.68 m
If an object moves with constant velocity,
a. its speed is constant. b. its direction is constant. c. its average speed is constant. d. its distance traveled per unit time is constant. e. all of these
A magnifying glass uses a converging lens with a refractive power of 20 diopters. What is the magnification if the image is to be viewed by a relaxed eye with a near point of 25 cm?
A) 5.0 B) 3.0 C) 4.0 D) 1.0 E) 2.0
After one half-life, a sample of a particular
radioactive material a) is twice as massive as the original sample of material. b) has its half-life reduced by one half. c) has only half the original activity. d) is no longer radioactive at all.