Double-Slit Interference: A double-slit interference experiment is performed in the air. Later, the same apparatus is immersed in benzene (which has an index of refraction of 1.50), and the experiment is repeated. When the apparatus is in benzene, you observe that the interference fringes are
A. more closely spaced than when the apparatus is in air.
B. equally spaced as when the apparatus is in air.
C. more widely spaced than when the apparatus is in air.
Answer: A
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The two masses in the figure are released from rest. After the 3.0-kg mass has fallen 1.5 m, it is moving with a speed of 3.8 m/s. What is the change in mechanical energy done on the system during this time interval by the frictional force on the 2.0 kg mass?
a.
?12 J
b.
?17 J
c.
?20 J
d.
?8.0 J
e.
?28 J
Some substances emit radiation without any need to expose the material to other energy sources. We call these substances
A. rotationally symmetric. B. thermal equilibrium. C. naturally radioactive. D. noble gases.
In a given frictionless displacement of a particle, its kinetic energy increases by 25 J while its potential energy decreases by 10 J. Determine the work of the nonconservative forces acting on the particle during this displacement
a. -15 J b. +35 J c. +15 J d. -35 J e. +55 J
The principal founders of the mathematical model of quantum mechanics were __________ and __________
Fill in the blank(s) with correct word