The angle of incidence of a light wave is
a. different depending on whether there is diffuse or specular reflection.
b. measured from a normal to the surface.
c. equal to the angle of refraction.
d. measured relative to the surface of the material.
b
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Which of the following statements about scientific theories and laws is correct?
Which statement correctly describes the role of gravity in galaxy formation?
A) Gravity makes the universe more uniform and smooth than it was at the beginning. B) Gravity makes galaxies spin. C) Gravity makes the dense regions denser. D) Gravity slows down photons so they collect into galaxies.
If you see Al going to your left at exactly 0.99c and Bob going to your right at exactly 0.99c, Al will say that Bob is
A) going away from her at 1.98c. B) going away from her at exactly 0.99c. C) going away from her at exactly c. D) going away from her at about 0.98c. E) going away from her faster than 0.99c, but slower than c.
A carousel that is 5.00 m in radius has a pair of 600-Hz sirens mounted on posts at opposite ends of a diameter. The carousel rotates with an angular velocity of 0.800 rad/s. A stationary listener is located at a distance from the carousel
The speed of sound is 350 m/s. The maximum beat frequency of the sirens at the position of the listener is closest to A) 6 Hz. B) 8 Hz. C) 10 Hz. D) 12 Hz. E) 14 Hz.