A2 nuclear physics

A2 nuclear physics

KG - University

25 Qs

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A2 nuclear physics

A2 nuclear physics

Assessment

Quiz

Physics

KG - University

Practice Problem

Medium

Used 15+ times

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25 questions

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1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Protactinium has a half-life of 70 s. A sample of protactinium is prepared and monitored over a period of time. Which of the following statements is correct?

The activity of the protactinium will be zero after 140 s.
The activity of the protactinium will be 25% of its initial value after 140 s.
The activity of the protactinium will be 12.5% of its initial value after 280 s.
The activity of the protactinium will never become zero.

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

In a famous thought experiment, Schrödinger imagined that a cat is locked in a box, along with a radioactive atom that is connected to a tube containing a deadly poison. If the atom decays, it causes the tube to smash and the cat to die. The random nature of radioactive decay means that the radioactive atom will

decay after one half life
probably decay after one half-life. 
have a fixed probability of decaying in a given time interval
have a number of possible decay paths. 

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The fuel used in a nuclear fission reactor is uranium. Which of the following is required for fission to proceed?

Neutrons must be removed from the reactor core.
The reactor core must be very hot
The uranium nuclei must absorb neutrons
The uranium nuclei must absorb protons

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

A radioactive source is placed a few cm away from a detector. There is no change in the count rate when a thin aluminium foil is placed between the source and the detector, but the count rate is reduced to the background rate when a 0.5 cm aluminium plate is introduced. These observations show that the source must be emitting

alpha and beta radiation
beta and gamma radiation
beta radiation only
gamma radiation only

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The force that causes protons and neutrons in the nucleus to attract to one another is the

strong nuclear force
electric repulsion
gravity
weak force

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Fission and fusion are both nuclear processes. Which of the following statements is correct for both processes?

Neutrons are released
No harmful radiation is produced
The binding energy per nucleon increases.
The total mass increases

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

When measuring the count rate from a radioactive source it is usual to also measure the background count rate. The background count rate must be

as large as possible for an accurate experiment
measured when the source is in place
recorded for the same time as the count rate
subtracted from the count rate measured from the source

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