A mirror has a hole cut in it so that a light can shine through. Opposite the mirror is another mirror, which is parallel to the first. The light ray hits the second mirror with angle 1, is reflected at an angle 2 , and then is incident on the first mirror at angle 3. At what angle to the normal, 3, in terms of 1, will the reflected ray then impact the first mirror?
1. /2 1
2. 1
3. /2 + 1
4. 1
[Ques. 2] A ray of light hits a flat surface at an angle and is diffusely reflected. At what angle is it reflected?
1.
2. 2
3.
4. unknown
[Ques. 3] Einstein's theory of the photoelectric effect treats light as photons. According to this theory,
1.all photons have the same energy.
2.photons that move faster have more energy.
3.photons with double the frequency have double the energy.
4.photons with double the frequency have half the energy.
[Ques. 4] The theory proposing light as a particle is supported by
1.the sparks created in Hertz' experiment with the spark gap oscillator.
2.the speed of light turning up in Maxwell's equations.
3.the interference caused by light in Young's double slit experiment.
4.the photoelectric effect Hertz discovered.
[Ques. 5] A solenoid is stretched uniformly to a greater length. If the pre-stretch magnetic field was B, and the length increased 50, what is the new value for the internal magnetic field in terms of B assuming the current does not change?
1. B/2
2. B
3. 3B/2
4. 2B/3
[Ques. 6] Suppose a long, straight wire carries a current upwards. A short distance directly east of the wire, a negatively charge particle is moving upwards parallel to the wire. In what direction is the magnetic force on the particle?
1.The force is upwards.
2.The force is eastward.
3.The force is westward.
4.Either there is no force or its direction is not given among these choices.
[Ques. 7] Solenoid 1 has 100 turns and is 10.0 cm long. Solenoid 2 has 200 turns and is 20.0 cm long. If a current of 0.50 A is carried by 1, what current must 2 carry so that it would produce a magnetic field at its center equal to that in 1?
1.0.25 A
2.0.50 A
3.1.00 A
4.4.00 A
[Ques. 8] The magnetic field of a long, straight wire has a value B0 at a distance of r0 when the current is I0. At a distance of 3.00 r0. what current is necessary to produce a field having the same strength B0 at this position?
1. 1.73 I0
2. 3.00 I0
3. 9.00 I0
4. More information is needed.
[Ques. 9] In a mass spectrometer where ions are fired at a given speed perpendicular to the magnetic field, what would be the ratio r20/r22 of the radii of the paths for singly-ionized neon atoms of masses 20 u and 22 u?
1.100/121
2.10/11
3.11/10
4.121/100
[Ques. 10] A charged particle moving perpendicular to a uniform magnetic field will follow a circular path with radius r = mv/Bq. If the magnetic field is doubled, what happens to the time that it takes for the particle to complete one loop around its path?
1.It doubles.
2.It quadruples.
3.It halves.
4.It stays the same.
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