The light reflected from a soap bubble (n = 1.40) appears red (? = 640 nm) at its center. What is the minimum thickness (in nm)?
a. 124
b. 104
c. 114
d. 134
e. 234
c
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Two devices that make use of a bimetallic strip are a __________ and a __________
Fill in the blank(s) with correct word
Two identical masses are attached by a light string that passes over a small pulley, as shown in Figure 6-6. The table and the pulley are frictionless. The masses are moving
A. with an acceleration equal to g. B. with an acceleration less than g. C. with an acceleration greater than g. D. at constant speed. E. with an acceleration that cannot be determined without additional information.
The decibel scale is:
a. linear: Three decibels minus two decibels equals one decibel. b. proportional: Three decibels is the square of two decibels, and four decibels is the square of three decibels. c. logarithmic: Two decibels is ten times one decibel; three decibels is ten times two decibels. d. inverse: A two decibel sound is half as loud as a one decibel sound. e. logarithmic by tens: Ten decibels is ten times one decibel; twenty decibels is one hundred times ten decibels.
A particle (q = ?4.0 ?C, m = 5.0 mg) moves in a uniform magnetic field with a velocity having a magnitude of 2.0 km/s and a direction that is 50° away from that of the magnetic field. The particle is observed to have an acceleration with a magnitude of 5.8 m/s2. What is the magnitude of the magnetic field?
A. 5.3 mT B. 4.9 mT C. 5.1 mT D. 4.7 mT E. 3.6 mT