Double-Slit Interference: A pair of narrow slits that are 1.8 mm apart is illuminated by a monochromatic coherent light source. A fringe pattern is observed on a screen 4.8 m from the slits. If the wavelength of the monochromatic light is 450 nm, what is the angular separation between adjacent dark fringes on the screen, measured in milliradians?
A. 0.15 mrad
B. 0.20 mrad
C. 0.25 mrad
D. 0.30 mrad
E. 0.36 mrad
Answer: C
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Two metal rods are made of the same material and have the same cross-sectional area. The two rods differ only in their lengths which we call L and 3L, respectively
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Which of the following statements about an ellipse is not true?
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Ming measures a recession velocity of 2000 km/sec for a galaxy. About how far away is that galaxy if the Hubble constant is 20 km/sec/million light years? (Hint: be sure to check the units in your calculation.)
A) 100 million light years B) 100 light years C) 40 thousand light years D) 40 billion light years
Which of the following statements is correct?
a. Because for an object in relative motion is always less than 1, a proper time interval ?tp is always shorter than the time interval ?t and a proper length Lp is always longer than the length L. b. Because for an object in relative motion is always greater than 1, a proper time interval ?tp is always longer than the time interval ?t and a proper length Lp is always shorter than the length L. c. Because for an object in relative motion is always less than 1, a proper time interval ?tp is always longer than the time interval ?t and a proper length Lp is always shorter than the length L. d. Because for an object in relative motion is always greater than 1, a proper time interval ?tp is always shorter than the time interval ?t and a proper length Lp is always longer than the length L.