A film of index of refraction n1 coats a surface with index of refraction n2. When n1
A.
.B.
.C.
.D.
.E.
.Answer: C
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Two long parallel wires carry currents of 20 A and 5.0 A in opposite directions. The wires are separated by 0.20 m. At what point between the two wires are the contributions from the two wires the same?
A) 0.040 m from the 20 A wire B) 0.080 m from the 20 A wire C) 0.12 m from the 20 A wire D) 0.16 m from the 20 A wire E) 0.18 m from the 20 A wire
A principal mechanism for energy loss during nuclear fusion is bremsstrahlung. This loss is associated with
a. x-rays emitted due to electron-ion collisions. b. radiation losses due to T4 losses. c. conduction losses associated with ?T. d. convection losses associated with ?T. e. neutron collisions with atoms of moderator.
A baseball (1 kg) has an energy of 100 joules. If its uncertainty in position is 1 m, what is the percentage uncertainty (?p/p × 10^0) in the momentum of the baseball?
a. <<1% b. 1% c. 2% d. 5% e. 10%
Which is greater, the gravitational attraction between a newborn baby and the Earth, or the gravitational attraction between the Earth and all the planets of the solar system?
A) the attraction between the baby and Earth B) the attraction between the planets and Earth C) They are roughly equal. D) The baby's and the planets gravitational attractions are inversely proportional to each other.