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level: 12/27/2020

Questions and Answers List

Question	Answer
In a Young’s double-slit experiment, the slit separation is doubled. To maintain the same fringe spacing on the screen, the screen-to-slit distance D must be changed to: A. D/2 B. D/√2 C. D√2 D. 2D E. 4D	D
A 5.0-ft woman wishes to see a full length image of herself in a plane mirror. The minimum length mirror required is: A. 5 ft B. 10 ft C. 2.5 ft D. 3.54 ft E. variable: the farther away she stands the smaller the required mirror length	C
A concave spherical mirror has a focal length of 12 cm. If an erect object is placed 6 cm in front of it: A. the magnification is 2 and the image is erect B. the magnification is 2 and the image is inverted C. the magnification is 0.67 and the image is erect D. the magnification is 0.67 and the image is inverted E. the magnification is 0.5 and the image is erect	A
The displacement of a string carrying a traveling sinusoidal wave is given by y(x, t) = ym sin(kx − ωt − φ) . At time t = 0 the point at x = 0 has a velocity of 0 and a positive displacement. The phase constant φ is: A. 45◦ B. 90◦ C. 135◦ D. 180◦ E. 270◦	E
A transverse traveling sinusoidal wave on a string has a frequency of 100 Hz, a wavelength of 0.040 m, and an amplitude of 2.0 mm. The maximum acceleration in m/s2 of any point on the string is: A. 0 B. 130 C. 395 D. 790 E. 1600	D