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Use the following information to answer the next question.
Data Recorded in a Photoelectric Effect Experiment
I The number of photoelectrons emitted each second
II The maximum kinetic energy of the emitted photoelectrons
III The charge on each of the emitted photoelectrons 30. The intensity of a light source that causes photoelectric emission is increased while
the frequency of the light source is kept constant. This increase will result in an
A. I only B.
D. II only
I and II only
II and III only 19 Use the following information to answer the next six questions.
A sample of iodine-131 has an initial mass of 76.0 mg. The activity of the
sample is measured and the amount of iodine-131 remaining in the sample
is determined. The following graph was obtained.
Mass of Iodine-131 Versus Elapsed Time Mass of Iodine - 131 (mg) 80.0
0.0 5.0 10.0
Time (days) 20.0 25.0 A particular nucleus of iodine-131 decays by emitting a beta particle that
travels at 2.34 × 105 m/s and gamma radiation that has a wavelength of
5.36 × 10–12 m. Extra momentum and kinetic energy are carried off by a
31. The half-life of iodine-131 is
A. 8.0 days B.
D. 12.0 days
24.0 days 20 Use your recorded answer from Multiple Choice 31 to answer Numerical Response 10.*
10. After 48.0 days the amount of iodine-131 that remains in the sample
is __________ mg. (Record your three-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. 32. The energy emitted as gamma radiation during the transmutation of an iodine-131
A. 3.55 × 10– 4 5 J B.
D. 2.68 × 10–27 J
1.24 × 10–22 J
3.71 × 10–14 J
Use the following additional information to answer the next question.
The momentum of the gamma ray photon and the beta particle can be
calculated. The momentum of a gamma ray photon (γ ) is determined by the
p=h λ 33. For the decay of iodine-131, the relationship between the magnitude of the
momentum of the gamma ray photon (pγ ) and the magnitude of the momentum of
the beta particle (pβ) can be represented by the equation
A. pγ = –pβ B. pγ = pβ C. pγ = (1.72 × 10–3) × pβ D. pγ = (5.80 × 102) × pβ 21 34. The equation for this radioactive decay is
D. 35. 131
53 I→ 127 I→ 132 I→ 132 I→ 131 51 54 53 54 Sb + beta + gamma + neutrino
Xe + beta + gamma + neutrino
I + beta + gamma + neturino
Xe + beta + gamma + neutrino To protect lab technicians from harmful radiation, the equipment used in this
experiment should be shielded with
D. lead to stop the γ radiation
paper to stop the β particles
an electric field to stop the γ radiation
a magnetic field to stop the β particles Numerical Response
11. An X-ray tube operates at an electrical potential difference of 1.00 × 105 V.
The minimum wavelength of the X-ray radiation it produces, expressed in
scientific notation, is b × 10–w m. The v...
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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