Two plane mirrors make an angle of 50° with one another. A ray of light parallel to mirror #1 reflects off mirror #2 and then strikes mirror #1 . What is the angle of incidence the ray makes with mirror #1?
a. 50°
c. 40°
b. The answer is not given.
d. 55°
C
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Phase Angles: A 120-V rms voltage at 60 Hz is applied across an RC circuit. The rms value of the current in the circuit is 0.60 A, and it leads the voltage by 60°. What is the capacitance in this circuit?
A. 13 ?F B. 14 ?F C. 15 ?F D. 16 ?F E. 17 ?F
Index of Refraction: Light having a wavelength in vacuum of 600 nm enters a liquid of refractive index 2.0. In this liquid, what is the wavelength of the light? (c = 3.0 × 108 m/s)
A. 1200 nm B. 600 nm C. 300 nm D. 150 nm E. 200 nm
When considering light as made up of individual "pieces," each characterized by a particular amount of energy, the pieces are called
A) photons. B) wavicles. C) gamma rays. D) frequencies.
To cause an object to move in a circle, a ______________ force is necessary
a. balanced b. functional c. centripetal d. centrifugal