The amount of light reflected from the front surface of common window glass is about
A) 4%.
B) 8%.
C) 40%.
D) 92%.
E) 96%.
Answer: A
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An iron ball and a wooden ball of the same size are dropped from a tall tower. Taking air resistance into consideration, the object to hit the ground first will be the
A) lighter wooden ball. B) heavier iron ball. C) both hit at the same time. D) not enough information
A narrow slit is illuminated with sodium yellow light of wavelength 589 nm. If the central maximum extends to ±30.0°, how wide is the slit?
a. 0.500 mm b. 2.20 × 10^?6 m c. 3.33 × 10^?5 m d. 1.18 ?m e. 5.89 ?m
A resistor and a capacitor are connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across the capacitor is
A) greater than the battery's terminal voltage. B) less than the battery's terminal voltage, but greater than zero. C) equal to the battery's terminal voltage. D) zero.
What is the inductive reactance of a 200 mH inductor attached to a 120 V rms 60.0 Hz source?
A. 12.0 
B. 75.4
C. 188 
D. 940
E. 24.0