The first evidence for a finite, not infinite, speed of light came from observations in which
A) Galileo measured the time for light to travel to a distant mountain and back again.
B) sunlight was observed just as the sun was fully eclipsed by the moon.
C) Galileo reflected a light beam from rapidly rotating mirrors in a laboratory.
D) the orbital time of one of Jupiter's moons was observed during two successive orbits.
E) sunlight passed through a narrow slit as the sun rose at the summer solstice (longest day of the year).
D
You might also like to view...
You observe a 1-cm-long crack in the middle of the glass windshield of your car. Compare the expected fracture strength of your defective glass windshield to that of a new one that has a tensile fracture strength of 69 MPa. Assume that the KIc of glass is 0.84 MPa?m1/2.
What will be an ideal response?
It can be concluded from Gauss's law for magnetism that
A) south magnetic poles do not exist. B) isolated magnetic poles sometimes exist. C) north magnetic poles do not exist. D) magnetic poles are pairs of electric charges. E) isolated magnetic poles do not exist.
Including relativistic effects, doubling the speed of a object:
a. has no effect on its momentum. c. less than doubles its momentum. b. more than doubles its momentum. d. doubles its momentum.
A football is thrown upward at a 30.0° angle to the horizontal. To throw a 40.0-m pass, what must be the initial speed of the ball?
What will be an ideal response?