OCR Gateway GCSE Physics: Combined Science

Topic Questions

GCSEPhysics: Combined ScienceOCR GatewayTopic Questions6. Radioactivity6.1 Radioactive Emissions

6.1 Radioactive Emissions

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11 mark

Which statement about alpha particles is correct?

  • They are fast moving electrons.

  • They are less penetrating than beta particles.

  • They can pass through lead.

  • They have less mass than beta particles.

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21 mark

Which radioactive decay equation is correct?

  • straight C presubscript 6 presuperscript 14 space rightwards arrow Be presubscript 4 presuperscript 10 space plus space straight e presubscript negative 1 end presubscript presuperscript 0

  • straight C presubscript 6 presuperscript 14 space rightwards arrow Be presubscript 4 presuperscript 10 space plus space gamma presubscript 0 presuperscript 0

  • straight C presubscript 6 presuperscript 14 space rightwards arrow straight N presubscript 7 presuperscript 14 space plus space He presubscript 2 presuperscript 4

  • straight C presubscript 6 presuperscript 14 space rightwards arrow straight N presubscript 7 presuperscript 14 space plus space straight e presubscript negative 1 end presubscript presuperscript 0

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31 mark

Which statement is true about the nucleus of an atom?

  • It contains neutrons and ions and has a negative charge.

  • It contains neutrons and ions and has a neutral charge.

  • It contains neutrons and protons and has a neutral charge.

  • It contains neutrons and protons and has a positive charge.

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11 mark

Beta radiation is used to check the thickness of thin aluminium foil at a factory.

Why is beta radiation used?

  • All electromagnetic radiation is reflected by aluminium foil.

  • Beta radiation will not pass through aluminium foil.

  • Beta radiation will partially pass through aluminium foil.

  • Beta radiation is reflected by aluminium foil.

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21 mark

What is the number of neutrons in this isotope of uranium?

bold U presubscript bold 92 presuperscript bold 238

  • 92

  • 119

  • 146

  • 238

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31 mark

When an electron in an atom changes energy level, it emits electromagnetic radiation.

Which row in the table is correct?

  Energy level of the electron Type of radiation emitted
A Decreases Almost any electromagnetic radiation.
B Decreases Visible light only.
C Increases Almost any electromagnetic radiation.
D Increases Visible light only.

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41 mark

All radioactive sources have a half-life.

Which statement about the half-life of a source is correct?

  • It is half the time for an atom to decay.

  • It is half the time for the activity of the source to decrease to zero.

  • It is half the time for the radioactive source to become safe.

  • It is the time for the activity of the source to decrease by half.

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51 mark

Which equation shows a correct alpha decay?

  • Am presubscript 95 presuperscript 241 rightwards arrow Np presubscript 91 presuperscript 239 space plus space He presubscript 4 presuperscript 2

  • Am presubscript 95 presuperscript 241 rightwards arrow Np presubscript 93 presuperscript 237 space plus space He presubscript 2 presuperscript 0

  • Am presubscript 95 presuperscript 241 rightwards arrow Np presubscript 93 presuperscript 237 space plus space He presubscript 2 presuperscript 4

  • Am presubscript 95 presuperscript 241 rightwards arrow Np presubscript 93 presuperscript 237 space plus space He presubscript 1 presuperscript 0

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61 mark

An element has more than one isotope.

Which row correctly describes the atoms of all isotopes of this element?

  Numbers of
electrons		 Numbers of
protons		 Numbers of
neutrons
A different different different
B same different different
C same same different
D same different same

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71 mark

Radium-226 is the most abundant isotope of radium.

Its nuclear mass is 226 and its nucleus contains 138 neutrons.

Which row is correct for another isotope of radium?

  • nuclear mass 226; 137 neutrons

  • nuclear mass 226; 139 neutrons

  • nuclear mass 227; 138 neutrons

  • nuclear mass 227; 139 neutrons

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81 mark

Radium-226, Ra presubscript 88 presuperscript 226 , decays to become radon-222, Rn presubscript 86 presuperscript 222.

What is emitted when a nucleus of radium-226 decays?

  • A beta particle

  • An alpha particle

  • Four neutrons

  • Four protons

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91 mark

A radioactive source has a half-life of 80 s.

How long will it take for 7 over 8 of the source to decay?

  • 10 s

  • 70 s

  • 240 s

  • 640 s

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101 mark

Higher Only

 

A teacher measures the radiation from a radioactive source for 10 days.
q5-paper4-june2018-ocr-gcse-physicsWhat is the half-life of this radioactive source?

  • 1 day

  • 2 days

  • 4 days

  • 5 days

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111 mark

An alpha particle collides with an atom to produce a positive ion.

What happens to the atom for it to become a positive ion?

  • It loses an electron from inside the nucleus.

  • It loses an electron from outside the nucleus.

  • It loses a neutron from inside the nucleus.

  • It loses a proton from outside the nucleus.

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