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Electrons move through a wire as shown below.
e– 21. What is the direction of the magnetic field at point P?
C. Into the page
Out of the page
Toward the top of the page D. Toward the bottom of the page Use the following information to answer the next question. 22.0˚ A radar pulse projected at an angle of elevation of 22.0° is reflected from an
aircraft and returned. (Note: The diagram is not drawn to scale. The height
of the radar transmitter/receiver can be ignored.) Numerical Response
5. If the pulse takes 1.28 × 10–4 s to make the round trip, then the vertical height of
the aircraft is __________ km.
(Record your three-digit answer in the numerical-response section on the answer sheet.) 11 Use the following information to answer the next three questions.
A proton with an energy of 894 eV travels perpendicular to a magnetic field
and moves in a circular path with a radius of 3.60 × 10– 4 m.
22. The speed of the proton is
D. 4.14 × 105 m/s
1.77 × 107 m/s
1.71 × 1011 m/s
3.14 × 1014 m/s Use your recorded answer from Multiple Choice 22 to answer Numerical Response 6.*
6. The strength of the magnetic field, expressed in scientific notation,
is a.bc × 10d T. The values of a, b, c, and d are _____ , _____ , _____ ,
and _____ . (Record your four-digit answer in the numerical-response section on the answer sheet.)
*You can receive marks for this question even if the previous question was answered incorrectly. 23. An alpha particle and a proton enter a magnetic field at the same speed. The radius
of the alpha particle’s path is
D. half the radius of the proton’s path
the same as the radius of the proton’s path
twice the radius of the proton’s path
four times the radius of the proton’s path 12 24. Which of the following expressions that deal with electromagnetic waves has a
A. λ B. f C. fλ D. f /λ Use the following information to answer the next two questions.
Mass spectrometers are used in archeological studies to help date ancient
artifacts. The relative amounts of carbon-12 and carbon-14 isotopes in a
sample of organic material may be used to determine the age of the sample.
Carbon-14 is a radioactive isotope that undergoes beta decay and has a
half-life of 5 730 years.
25. The product of the carbon-14 decay is
8O C. 10
4 Be D. 26. 14
6C An archeological sample is dated using the carbon-14 dating process and is found
to be 2 865 years old. What percentage of the original carbon-14 remains?
75.0% 13 Use the following information to answer the next four questions.
Physicists have produced “optical cooling” by shining a laser onto glass that
contains ytterbium ions (Yb3+). The glass with ytterbium ions absorbs the
laser photons and radiates photons with a shorter wavelength, as shown below.
This process decreases the temperature of the glass with ytterbium ions.
photons Emitted photons Glass
λ = 1 008 nm Yb λ = 995 nm Temperature decrease
≈ 0.03° C One theory suggests that the cooling occurs because of electron movement
between energy levels in the ytterbium ions, as shown below. If a ground state
electron in an ytterbium ion absorbs a small amount of thermal energy, it
moves to the second energy level (n = 2). The ion then absorbs the laser
photon, which moves the electron to the excited state (n = 3). The cooling
occurs when the ytterbium ion emits a photon.
λ = 1 008 nm n=3
Ground state n=1 14 λ = 995 nm 27. When the glass cools, the ions lose both the thermal energy and the energy that was
absorbed from the laser photons. The electron energy level transition that occurs is
from energy level
n=3 Numerical Response
7. The frequency of the laser photons, expressed in scientific notation, is
a.b × 10cd Hz. The values of a, b, c, and d are _____ , _____ , _____ ,
and _____ .
(Record your four-digit answer in the numerical-response section on the answer sheet.) 28. The energy difference between a laser photon and an emitted photon is
D. 29. 2.00 × 10–19 J
1.97 × 10–19 J
2.58 × 10–21 J
8.62 × 10–33 J Visible light has frequencies that range between 4.3 × 1014 Hz (red) and
7.5 × 1014 Hz (violet). Which of the following statements best describes the
absorbed laser photon and the emitted photon in the optical cooling experiment?
D. Both photons are in the infrared range.
Both photons are in the ultraviolet range.
Both photons are in the visible light range.
One photon is in the visible light range, and one is not in the
visible light range. 15 30. In certain scattering experiments, alpha particles bounce backward from a thin
metal target. This observation led to the hypothesis that
D. alpha particles car...
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This note was uploaded on 01/14/2014 for the course PHYSICS Physics 30 taught by Professor Quinlan during the Fall '09 term at Centennial High School.
- Fall '09