The maximum mass of a white dwarf is
A) about the mass of our Sun.
B) about 1.4 times the mass of our Sun.
C) limitless; there is no theoretical limit to the maximum mass of a white dwarf.
D) about 3 times the mass of our Sun.
B) about 1.4 times the mass of our Sun.
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An unclad optical fiber has index of refraction 1.70 . What is the acceptance angle for this fiber? The acceptance angle is the greatest angle at which the light enters the end of the fiber and still causes total internal reflection
a. 38.7° c. 39.7° b. 51.3° d. Any angle will be accepted.
The wave front shown at the left for light in air reaches the plane surface (shown by a slanted line) that bounds a medium with n = 1.50.
Which diagram below correctly shows the wave front while entering the medium at the right?
A. A B. B C. C D. D E. E
If you had only one telescope and wanted to take both visible-light and ultraviolet pictures of stars, where should you locate your telescope?
A. on Earth’s surface B. on a tall mountain C. in an airplane D. in space
A cart is given an initial velocity of 5.0 m/s and experiences a constant acceleration of 2.4 m/s2 . What is the magnitude of the cart's displacement during the first 5.0 s of its motion?
a. 35 m b. 85 m c. 55 m d. 11 m e. 17 m