Bright and dark fringes are seen on a screen when light from a single source reaches two narrow slits a short distance apart. The locations of bright and dark fringes can be interchanged if a thin film is placed in front of one of the slits. The minimum width of this film must be
A.
.B.
.C.
.D.
.E.
.Answer: D
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In an ac circuit, the current in an inductor
A. leads the voltage by 90
B. lags the voltage by 90
C. is in phase with the voltage.
D. leads the voltage by
radians.
E. lags the voltage by
radians.
A ball is subjected to a pressure of 25.0 atmospheres. The un-squeezed diameter of the ball is 4.00 cm. The squeezed diameter of the ball is 3.99 cm. The bulk strain on the ball is
a. 
b. 
c. 
d. 
e. 
The half-life of a radioactive isotope is
A) half the time that it takes for a radioactive isotope to eat a large pizza. B) half the time required for the decay of a large sample of nuclei of that isotope. C) half the time required for a nucleus of that isotope to decay. D) the time required for the decay of half of a large sample of nuclei of that isotope. E) the time required for a nucleus of that isotope to partially decay.
During a single period, the distance traveled by a wave is
A) one-half wavelength. B) one wavelength. C) two wavelengths. D) more information is needed