The diagram shows the paths of three different types of radiation, X, Y and Z. Which row in the table correctly identifies X, Y and Z?

X: β-particles Y: α-particles Z: γ-rays

X: α-particles Y: β-particles Z: γ-rays

X: β-particles Y: γ-rays Z: α-particles

X: γ-rays Y: α-particles Z: β-particles

Which statement about α-radiation is correct?

It is more highly ionising than γ-radiation.

It is a stream of fast-moving electrons.

It is a form of electromagnetic radiation.

It is more penetrating than β-radiation.

α, β and γ-radiations are emitted by radioactive substances. Which statement is correct?

α-radiation consists of charged particles and is the most highly ionising radiation.

β-radiation consists of charged particles and is the most penetrating radiation.

β-radiation consists of uncharged particles and is the least highly ionising radiation.

γ-radiation consists of uncharged particles and is the least penetrating radiation.

A student investigates how the radiation from a radioactive source changes with time. The table shows the results from the detector used by the student. The experiment is repeated by many other students, who also measure the count rate every two minutes. The half-life of the source is known to be exactly 2.0 minutes. Why is the measured count rate always greater than half the previous value?

There is background radiation present.

Radioactive emissions occur randomly with time.

The detector used is very close to the source.

The radioactive source is decaying.

Compared with β-particles and γ-rays, α-particles

have the greatest ionising effect.

are the only type of radiation to carry a charge.

have the greatest penetrating effect.

A radioactive source emits three types of radiation R, S and T. The diagram shows an experiment set up to study the penetrating properties of R, S and T. Which types of radiation are R, S and T?

R: α-particles; S: γ-rays; T: β-particles

R: α-particles; S: β-particles; T: γ-rays

R: β-particles; S: α-particles; T: γ-rays

R: γ-rays; S: β-particles; T: α-particles

A radiation detector is placed close to a source of β-particles. Aluminium sheets of increasing thickness are placed between the source and the detector. Eventually a sheet which is 2.0 cm thick is used. The reading on the detector decreases, but does not fall to zero. Why does the reading not fall to zero?

There is always some background radiation.

Some of the β-particles go round the edges of the sheet.

The detector is too close to the source.

The sheet can never be thick enough to absorb all the β-particles.

Why are some radioactive sources stored in boxes made from lead?

Lead absorbs emissions from the radioactive sources.

Lead decreases the half-life of radioactive sources.

Lead increases the half-life of radioactive sources.

Lead repels emissions from the radioactive sources.

The diagram shows the paths of three different types of radiation, X, Y and Z. Materials: 2 mm of plastic, 10 mm of aluminium, 50 mm of lead. Identify X, Y and Z. Which shows correct identities of X, Y and Z?

X: β-particles, Y: α-particles, Z: γ-rays

X: α-particles, Y: β-particles, Z: γ-rays

X: β-particles, Y: γ-rays, Z: α-particles

X: γ-rays, Y: α-particles, Z: β-particles

When measuring the emissions from a radioactive rock brought into the laboratory, a teacher mentions that background radiation must be taken into account. What is this background radiation?

ionising radiation in the laboratory when the radioactive rock is not present

infra-red radiation from warm objects in the laboratory

infra-red radiation from the Sun

ionising radiation from the radioactive rock brought into the laboratory

A scientist needs to use a source of γ-rays as safely as possible. Which action will not reduce the amount of radiation that reaches the scientist?

keeping the temperature of the source as low as possible

keeping the distance between the source and the scientist as large as possible

keeping the time for which the scientist uses the source as small as possible

placing a lead screen between the scientist and the source

The arrangement shown is used to check whether the flour inside a cardboard packet is above a certain level. If it is above this level, the flour absorbs the radiation from the source so that it doesn’t reach the detector. Which type of radiation is suitable to use?

either α-particles or β-particles

A beam of γ-rays passes between two charged metal plates as shown in the diagram. How do the γ-rays pass between the two charged plates?

The rays will continue in the same direction.

The rays are deflected in a direction perpendicular to the page

The rays are deflected towards the negative plate.

The rays are deflected towards the positive plate.

20 Radioactivity PMT

Authored by Lee Peng TUNG

Physics

11th Grade

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49 questions

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FILL IN THE BLANK QUESTION

1 min • 1 pt

A radioactive nucleus emits either an α-particle or a β-particle. What are the products of these two types of radioactive emission?

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

A reading is taken every 10 minutes of the number of emissions per second from a radioactive source.
The table shows the readings.
What is the half-life of the source?

10 min

20 min

40 min

60 min

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The graph shows how the decay rate of a radioactive source changes with time.
What will be the activity at 8 days?

0 decays/s

125 decays/s

250 decays/s

500 decays/s

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Radioactive materials should be handled carefully. Which safety precaution does not reduce the risk to people using a radioactive material?

keeping the material a long distance from people

keeping the material at a low temperature

using lead screening between the material and people

using the material for only a short time

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

A sample of a radioactive isotope has an initial rate of emission of 128 counts per minute and a half-life of 4 days.
How long will it take for the rate of emission to fall to 32 counts per minute?

2 days

4 days

8 days

12 days

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

A scientist carries out an experiment using a sealed source which emits β-particles. The range of the β-particles in the air is about 30 cm. Which precaution is the most effective to protect the scientist from the radiation?

handling the source with long tongs

keeping the temperature of the source low

opening all windows in the laboratory

washing his hands before leaving the laboratory

FILL IN THE BLANK QUESTION

1 min • 1 pt

Which row describes the nature of α-particles and of γ-rays?

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20 Radioactivity PMT

A radioactive nucleus emits either an α-particle or a β-particle. What are the products of these two types of radioactive emission?

A reading is taken every 10 minutes of the number of emissions per second from a radioactive source.
The table shows the readings.
What is the half-life of the source?

The graph shows how the decay rate of a radioactive source changes with time.
What will be the activity at 8 days?

Radioactive materials should be handled carefully. Which safety precaution does not reduce the risk to people using a radioactive material?

A sample of a radioactive isotope has an initial rate of emission of 128 counts per minute and a half-life of 4 days.
How long will it take for the rate of emission to fall to 32 counts per minute?

A scientist carries out an experiment using a sealed source which emits β-particles. The range of the β-particles in the air is about 30 cm. Which precaution is the most effective to protect the scientist from the radiation?

Which row describes the nature of α-particles and of γ-rays?

The diagram shows the paths of three different types of radiation, X, Y and Z.
Which row in the table correctly identifies X, Y and Z?

A powder contains 400 mg of a radioactive isotope that emits α-particles.
The half-life of the isotope is 5 days.
What mass of this isotope remains after 10 days?

Which row gives the properties of the radiation from radioactive materials?

Access all questions and much more by creating a free account

Similar Resources on Wayground

Popular Resources on Wayground

Discover more resources for Physics

20 Radioactivity PMT

A radioactive nucleus emits either an α-particle or a β-particle. What are the products of these two types of radioactive emission?

A reading is taken every 10 minutes of the number of emissions per second from a radioactive source. The table shows the readings. What is the half-life of the source?

The graph shows how the decay rate of a radioactive source changes with time.What will be the activity at 8 days?

Radioactive materials should be handled carefully. Which safety precaution does not reduce the risk to people using a radioactive material?

A sample of a radioactive isotope has an initial rate of emission of 128 counts per minute and a half-life of 4 days. How long will it take for the rate of emission to fall to 32 counts per minute?

A scientist carries out an experiment using a sealed source which emits β-particles. The range of the β-particles in the air is about 30 cm. Which precaution is the most effective to protect the scientist from the radiation?

Which row describes the nature of α-particles and of γ-rays?

The diagram shows the paths of three different types of radiation, X, Y and Z. Which row in the table correctly identifies X, Y and Z?

A powder contains 400 mg of a radioactive isotope that emits α-particles. The half-life of the isotope is 5 days. What mass of this isotope remains after 10 days?

Which row gives the properties of the radiation from radioactive materials?

Access all questions and much more by creating a free account

Similar Resources on Wayground

Popular Resources on Wayground

Discover more resources for Physics

A reading is taken every 10 minutes of the number of emissions per second from a radioactive source.
The table shows the readings.
What is the half-life of the source?

The graph shows how the decay rate of a radioactive source changes with time.
What will be the activity at 8 days?

A sample of a radioactive isotope has an initial rate of emission of 128 counts per minute and a half-life of 4 days.
How long will it take for the rate of emission to fall to 32 counts per minute?

The diagram shows the paths of three different types of radiation, X, Y and Z.
Which row in the table correctly identifies X, Y and Z?

A powder contains 400 mg of a radioactive isotope that emits α-particles.
The half-life of the isotope is 5 days.
What mass of this isotope remains after 10 days?