Motion combines the concepts of position
change (length) and time. Which of the
following combination of units is used to
describe the velocity of a moving object?
a)length/time
b)length x time
c)time/length
d)Length/time2
a
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Time Dilation: A particle physicist observes cosmic rays creating a new particle high in the atmosphere, and the speed of this particle is measured at 99.7% the speed of light. It is unstable, and is observed to decay in an average 37.0 ?s. If this particle were at rest in the laboratory, what would be its average lifetime?
A. 2.9 µs B. 18 µs C. 5.3 µs D. 12 µs E. 4.3 µs
In an interference pattern, the wavelength and frequency are
a. the same in both the regions of constructive interference and the regions of destructive interference. b. greater in regions of constructive interference than in regions of destructive interference. c. smaller in regions of constructive interference than in regions of destructive interference. d. unchanged in regions of destructive interference but greater in regions of constructive interference. e. unchanged in regions of destructive interference but smaller in regions of constructive interference.
A system of an electron and a neutron has a net charge of
a. +1.6 × 10^-19 C. b. –1.6 × 10^-19 C. c. 3.2 × 10^-19 C. d. zero.
What is the power of the lens that has a focal length of 40 cm and a diameter if 5.0 cm?
A) +0.20 diopters B) +2.5 diopters C) +2.7 diopters D) +20 diopters E) -2.5 diopters