Fresnel lenses are
a. made of mirror segments
b. made of the surface portions of a regular lens
c. found in some auto headlamps and theater lights and rear windows of RVs
d. all of the above
B, C
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Proxima Centauri is _____ away from Earth
A) 2.1 light-years B) 4.2 light-years C) 6.3 light-years D) 8.4 light-years
In the formula E = mc2, what does E represent?
A) the kinetic energy of a moving object B) the radiative energy carried by light C) the gravitational potential energy of an object held above the ground D) the mass-energy, or potential energy stored in an object's mass E) the electric charge of the object
What is the charge on 1.0 kg of protons? (e = 1.60 × 10-19 C, mproton = 1.67 × 10-27 kg)
A) 1.0 C B) 1000 C C) 9.6 × 107 C D) 6.0 × 1026 C E) 6.0 × 1023 C
Except for their color, a perfectly black (absorbing) object is identical to a perfectly white (reflecting) object. If identical light falls on both of these objects, what is true about the momentum they will receive from this light?
A) The white object will receive twice as much as the black object. B) The white object will receive four times as much as the black object. C) The black object will receive four times as much as the white object. D) The black object will receive twice as much as the white object. E) They will both receive the same amount.