Contamination and Irradiation
21 hours ago
stanton_wertjes
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40 QuestionsShow answers
  • Question 1
    180 seconds
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    Q.

    Is radioactive decay 'spontaneous' ?

    answer choices

    yes

    no

    sometimes

  • Question 2
    180 seconds
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    Q.

    Is radioactive decay 'random' ?

    answer choices

    yes

    no

    sometimes

  • Question 3
    180 seconds
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    Q.

    Which best describes what happens during radioactive decay?

    answer choices

    the emission of radioactivity

    the build up of radioactivity

    the splitting of radioactivity

    the expansion of radioactivity

  • Question 4
    180 seconds
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    Q.

    During radioactive decay, the element can change?

    answer choices

    true

    false

  • Question 5
    180 seconds
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    Q.

    During radioactive decay ....?

    answer choices

    another element might be made

    another element is always made

    another element is never made

  • Question 6
    60 seconds
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    Q. What percent of carbon-14 would be left after 5730 years?
    answer choices
    100%
    75%
    50%
    25%
  • Question 7
    120 seconds
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    Q. What is the half-life of iodine-131?
    answer choices
    32 days
    8 days
    16 days
    24 days
  • Question 8
    60 seconds
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    Q. 146C has a half life of 5730 years, how many years would it take the 4.0 g sample to decay to 0.25 g?
    answer choices
    4 years
    5730 years
    22,920 years
    28,650 years
  • Question 9
    900 seconds
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    Q. If the half-life of uranium-232 is 70 years, how many half-lives will it take for 10 g of it to be reduced to 1.25 g?
    answer choices
    1 half-life
    2 half-lives
    3 half-lives
    4 half-lives
  • Question 10
    30 seconds
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    Q. What type of decay is being illustrated in following picture? 
    answer choices
    beta decay
    alpha decay 
  • Question 11
    30 seconds
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    Q.

    In the early twentieth century the apparatus shown in the diagram was used to investigate atomic structure. When He2+ particles were fired at a thin sheet of gold, most of the particles were detected at point P. What conclusion can be drawn from the detection of He2+ particles at point P?

    answer choices

    Gold atoms contain electrons.

    Gold atoms contain protons.

    Gold atoms contain neutrons.

    Gold atoms are mainly empty space.

  • Question 12
    30 seconds
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    Q.

    When He2+ particles were fired at a thin sheet of gold, about 1 in 8000 of the particles were detected at point Q. What conclusion can be drawn from the detection of He2+ particles at point Q?

    answer choices

    Gold atoms have a small, positive nucleus.

    Gold atoms have electrons in orbitals.

    Gold consists of ions in a sea of delocalised electrons.

    Gold atoms have more protons than He2+ particles.

  • Question 13
    30 seconds
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    Q.

    Which of these correctly shows the numbers of sub-atomic particles in a 41K+ ion?

    answer choices

    Number of electrons: 19, Number of protons: 19, Number of neutrons: 20

    Number of electrons: 18, Number of protons: 20, Number of neutrons: 21

    Number of electrons: 18, Number of protons: 19, Number of neutrons: 22

    Number of electrons: 19, Number of protons: 18, Number of neutrons: 23

  • Question 14
    30 seconds
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    Q.

    Which of these correctly shows the numbers of sub-atomic particles in a 21Na+ ion?

    answer choices

    Number of electrons: 11, Number of protons: 11, Number of neutrons: 10

    Number of electrons: 10, Number of protons: 12, Number of neutrons: 9

    Number of electrons: 10, Number of protons: 11, Number of neutrons: 10

    Number of electrons: 11, Number of protons: 10, Number of neutrons: 11

  • Question 15
    30 seconds
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    Q.

    Which of these correctly shows the numbers of sub-atomic particles in a 42Ca2+ ion?

    answer choices

    Number of electrons: 20, Number of protons: 20, Number of neutrons: 22

    Number of electrons: 18, Number of protons: 21, Number of neutrons: 21

    Number of electrons: 18, Number of protons: 20, Number of neutrons: 22

    Number of electrons: 20, Number of protons: 19, Number of neutrons: 23

  • Question 16
    30 seconds
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    Q.

    Which model of the atom is denoted as the "plum pudding" model?

    answer choices

    A

    B

    C

    D

    E

  • Question 17
    30 seconds
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    Q. This model this model was the first to show a nucleus, consisting of protons and neutron.  Electrons surround the nucleus but are not shown in distinct energy levels. 
    answer choices
    The "Rutherford Model" of the atom
    The "Plum Pudding Model" of the atom
    The "Quantum Mechanical Modell" of the atom
    Democritus's model of the atom
  • Question 18
    30 seconds
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    Q. This model added on to previous models by showing electrons existed at certain "energy levels". However it does not accurately show what those levels look like.
    answer choices
    The "Bohr Model" of the atom
    The "Rutherford Model" of the atom
    The "Plumb Pudding Model" of the atom
    The "Quantum Mechanical Model" of the atom
  • Question 19
    30 seconds
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    Q. This model was developed after J.J. Thompson discovered electrons, a particle smaller than an atom. Is shows electrons floating freely in a positive space.
    answer choices
    The "Plum Pudding Model" of the atom
    The "Rutherford Model" of the atom
    Democritus's model of the atom
    The "Quantum Mechanical Model" of the atom
  • Question 20
    45 seconds
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    Q. Ernest Rutherford discovered that atoms were mostly _________________. 
    answer choices
    negatively charged
    positively charged
    electrons
    empty space. 
  • Question 21
    30 seconds
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    Q.

    An atom in which the number of protons is greater than the number of neutrons is:

    answer choices

    234U

    6Li

    3He

    2H

  • Question 22
    30 seconds
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    Q.

    Which of these atoms has the smallest number of neutrons?

    answer choices

    3H

    4He

    5He

    4Li

  • Question 23
    30 seconds
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    Q.

    Americium-241 (24195Am) is an isotope of americium. Which of the isotopes given in the table below is not an isotope of americium?

    answer choices

    A

    B

    C

  • Question 24
    30 seconds
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    Q.

    The graph shows how the number of americium-241 nuclei in a sample changes with time. How many years does it take for the number of americium-241 nuclei to decrease from 10,000 to 5,000?

    answer choices

    430 years

    500 years

    400 years

    800 years

  • Question 25
    30 seconds
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    Q.

    A teacher used a Geiger-Muller tube and counter to measure the number of counts in 2 minutes for a radioactive rock. The counter recorded 980 counts in two minutes. The background radiation count rate was 0.25 counts per second. Calculate the count rate for the rock.

    answer choices

    7.92 per second

    8.16 per second

    490 per second

    489.75 per second

  • Question 26
    30 seconds
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    Q.

    A householder is worried about the radiation emitted by the granite worktop in his kitchen. 1 kg of granite has an activity of 1250 Bq. The kitchen worktop has a mass of 180 kg. Calculate the activity of the kitchen worktop in Bq.

    answer choices

    225,000 Bq

    6.94 Bq

    0.144 Bq

    25,000 Bq

  • Question 27
    30 seconds
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    Q.

    In an experiment, a teacher put a 2 mm thick lead sheet in front of a radioactive source. She used a detector and counter to measure the radiation passing through the lead sheet in one minute. She then put different numbers of lead sheets, each 2 mm thick, in front of the radioactive source and measured the radiation passing through in one minute. The readings taken by the teacher are plotted in the graph. How does the amount of radiation transmitted by the lead change as the total thickness of the lead is increased?

    answer choices

    it increases

    it decreases

    it stays constant

  • Question 28
    30 seconds
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    Q.

    An atom that loses an electron is called an _____________________and has an overall _________________________ charge.

    answer choices

    ion ; positive

    ion ; negative

    isotope ; positive

    ion ; neutral

  • Question 29
    30 seconds
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    Q.

    Carbon-14 and carbon-12 are two of the isotopes of carbon. The nucleus of a carbon-12 atom has the same number of ________________ as the nucleus of a carbon-14 atom.

    answer choices

    protons

    neutrons

    electrons

  • Question 30
    30 seconds
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    Q.

    State the number of neutrons in an atom of iodine-135 (13553I)

    answer choices

    78

    82

    131

    53

  • Question 31
    30 seconds
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    Q.

    The graph shows how the number of americium-241 nuclei in a sample changes with time. What is the half-life of americium-241?

    answer choices

    430 years

    500 years

    400 years

    800 years

  • Question 32
    30 seconds
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    Q.

    The half-life of As-81 is 33s. How long does it take for a 100g sample of As-81 to decay to 6.25g?

    answer choices

    33 seconds

    66 seconds

    2.2 minutes

    5.5 minutes

  • Question 33
    30 seconds
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    Q.

    How old is a bone if it presently contains 0.3125g of carbon-14 and it was estimated to originally contain 80g? The half-life of carbon-14 is 5730 years.

    answer choices

    5730 years old

    11460 years old

    45840 years old

    22920 years old

  • Question 34
    30 seconds
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    Q.

    Sodium-25 was to be used in an experiment, but it took 3 minutes to get the sodium from the reactor to the laboratory. If 5 mg of sodium-25 was removed from the reactor, how many mg of sodium-25 would be available to use in the laboratory? The half-life of Na-25 is 60 seconds.

    answer choices

    5 mg

    0.625 mg

    2.5 mg

    1.25 mg

  • Question 35
    30 seconds
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    Q.

    Use the graph to determine the half-life of the radioactive sample. The x-axis label is time in seconds

    answer choices

    1 minute

    20 seconds

    40 seconds

    80 seconds

  • Question 36
    30 seconds
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    Q.

    State the likely count rate after 180 seconds

    answer choices

    20 counts per minute

    10 counts per minute

    5 counts per minute

    2 counts per minute

  • Question 37
    30 seconds
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    Q.

    The graph shows how the count rate from a sample of technetium-99 changes with time. State the half-life of technetium-99.

    answer choices

    6 hours

    4 hours

    12 hours

    18 hours

  • Question 38
    30 seconds
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    Q.

    The graph shows how the count rate from a sample of technetium-99 changes with time. What would the count rate be after 24 hours?

    answer choices

    9.38 counts per minute

    75 counts per minute

    37.5 counts per minute

    18.75 counts per minute

  • Question 39
    30 seconds
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    Q.

    he graph shows how the count rate of a sample of iodine-131 changed over 24 days. What is the half-life of iodine-131?

    answer choices

    8 days

    4 days

    16 days

    24 days

  • Question 40
    30 seconds
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    Q.

    U‐238 has a half‐life of 4.46 billion years. How much U‐238 was present initially if 2 grams remains after 13.38 billion years?

    answer choices

    0.5 g

    1 g

    8 g

    4 g

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