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Final

PHYS 100 University of Rochester P100 2007 FinalExam SolutionssExam


Department
Physics
Course Code
PHY 100
Professor
All
Study Guide
Final

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P100 University of Rochester NAME _________________________________________
S. Manly Spring 2007
Final Exam (May 8, 2007)
Please read the problems carefully and answer them in the space provided. Write on
the back of the page, if necessary. Show your work where requested in order to be
considered for partial credit. In problems where you are requested to show your work,
no credit will be given unless your work is shown.
Problem 1 (13 pts, no need to show work):
By each description on the left, put the letter of the answer on the right that best fits. There may
be more than one answer on the right that works, in which case any of the correct answers is
sufficient.
a. electron
b. muon neutrino
c. proton
d. pion
e. charm (c) quark
f. W
g. gluon
h. higgs
i. Z
j. top (t) quark
k. muon
l. photon
m. up (u) quark
n. graviton
o. hydrogen atom
p. hadron
q
. bar
y
on
___ One type of quark found in neutrons
___ Force carrier (gauge boson) for
electromagnetic interaction
___ Force carrier (gauge boson) for strong
interaction
___ Only undiscovered particle predicted
by the Standard Model of particle physics
___ Particle that can pass through light
years of lead without interacting
___ One of the particles mediating the
weak interaction (force carrier for weak
interaction)
___ A particle made up of three quarks
___ An example of a meson
___ An example of a lepton
___ A massless particle
(3 pts) List below three of the five particles
listed to the right which are known to be
made of other particles (have constituents).
__________________________________

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P100 University of Rochester NAME _________________________________________
S. Manly Spring 2007 Scores
1. ___/13
2. ___/3
3. ___/3
4. ___/3
5. ___/3
6. ___/3
7. ___/3
8. ___/3
9. ___/3
10. ___/3
11. ___/3
12. ___/3
13. ___/3
14. ___/7
15. ___/4
16. ___/3
17. ___/3
18. ___/6
19. ___/6
20. ___/6
21. ___/6
22. ___/7
23. ___/3
Total ___/100
Problem 2 (3 pts, no need to show work):
Is it possible to prove, for certain, that a scientific theory is true?
a) Yes, by means of a single confirmed experiment that verifies the theory.
b) Yes, by carrying out a sufficient number of experimental observations.
c) Yes, by deducing it logically from other scientific theories that are known to be true.
d) No, because it is always possible that a future experiment will disagree with the theory.
e) No, because of the experimental error, or uncertainty, that is always present in any
experimental result.
Problem 3 (3 pts, no need to show work):
Is it possible for the driver of a car to accelerate the car without pressing on the accelerator pedal?
a) Yes, by pressing the brake pedal.
b) Yes, by turning the steering wheel.
c) Yes, by both of the above methods.
d) No, because the only way to speed up a car is to press on the accelerator pedal.
e) No, because an object in motion remains in motion unless acted on by a force.
Problem 4 (3 pts, no need to show work):
Suppose you are on the moon and you drop a rock and a feather at the same time. You will find
that
a) the two fall at the same speed, but this speed is slower than a rock would fall on Earth.
b) the two fall at the same speed, and this speed is the same as the speed of a rock falling on
Earth.
c) the rock falls faster than the feather, although both of them fall slower than they would on
Earth.
d) the rock falls faster than the feather, and both speeds are the same as they would be on
Earth.
e) they don’t fall. They remain suspended above the surface of the moon.
Problem 5 (3 pts, no need to show work):
Two sources of waves, call them A and B, send out waves across the surface of a lake. The
waves from A have crests 1 cm high as measured from the normal undisturbed surface of the
water. The waves from B are identical to those from A. How far is the water displaced at a point
where a crest from A crosses a valley from B?
a) 2 cm above.
b) 1 cm above.
c) No displacement.
d) 1 cm below
e) 2 cm below

Only pages 1-3 are available for preview. Some parts have been intentionally blurred.

P100 University of Rochester NAME _________________________________________
S. Manly Spring 2007
Problem 6 (3 pts, no need to show work):
Ernest Rutherford’s experiments in which alpha particles passed through or scattered from a thin
piece of gold foil demonstrated that
a) Light is a wave.
b) Light is made of particles.
c) The atom contains a tiny nucleus containing most of the atom’s mass and positive charge.
d) Electrons exist.
e) Neutrons exist.
f) It is possible to generate x-rays from a heavy metal.
Problem 7 (3 pts, no need to show work):
Two electromagnetic waves have different frequencies but equal amplitudes. The one with the
higher frequency has
a) Greater speed.
b) Longer wavelength.
c) Greater energy.
d) All of the above.
e) None of the above.
Problem 8 (3 pts, no need to show work):
Velma’s rocket ship is moving away from Mort at a speed of 0.75c. Mort fires a laser beam
toward her spaceship, observing the tip of the laser beam to move away from him at speed c.
Velma observes this laser beam to move past her at a speed of
a) 1.75c.
b) 1.25c.
c) c.
d) 0.75c.
e) 0.25c.
f) The light never catches up with Velma.
Problem 9 (3 pts, no need to show work):
If you were in a spaceship in outer space and accelerating at 0.5g, how heavy would you feel?
a) weightless.
b) half your normal weight.
c) your normal weight.
d) 1.5 times your normal weight.
e) The answer depends on how fast the spaceship is moving.
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