The wavelength of an electromagnetic wave is 600 nm. What is its frequency?
A) 200 × 1012 Hz
B) 300 × 1012 Hz
C) 400 × 1012 Hz
D) 500 × 1012 Hz
E) 600 × 1012 Hz
D
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A 200-kg box is placed on a ramp. As one end of the ramp is raised, the box begins to move downward just as the angle of inclination reaches 18.0°. What is the coefficient of static friction between box and ramp?
a. 0.42 b. 0.32 c. 3.1 d. 0.27 e. 62
The lower A on a piano has a frequency of 30.0 Hz. If the tension in the 2.00-m-long string is 316 N and one-half wavelength occupies the string, what is the mass of the string?
a. 61.4 g b. 21.9 g c. 17.6 g d. 43.9 g e. 91.1 g
In a parallel circuit, the size of the current flowing through each device may be different
a. True b. False Indicate whether the statement is true or false
If an optical system consists only of an object and a single convex mirror,
a. the image will sometimes be inverted. b. the magnification will sometimes have an absolute value greater than 1. c. the image distance will never be negative. d. the image will always be virtual.