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Form 3 Chapter 8: RADIOACTIVITY

Total questions: 22

Worksheet time: 13mins

Name
Class
Date
1.

which form of radiation is stopped by aluminium but not paper?

a)

Alpha

b)

Beta

c)

Gamma

2.

Which form of radiation is not deflected in an electric or magnetic field?

a)

Alpha

b)

Beta

c)

Gamma

3.

Radioactivity is spontaneous and random.

a)

True

b)

False

4.

What form of radioactive decay that reduces the atomic number or number of protons by 2?

a)

Alpha

b)

Beta

c)

Gamma

d)

None of the answers listed

5.

What do we call the tiny core at the center of an atom?

a)

Electron

b)

Neutron

c)

Proton

d)

Nucleus

6.

how much time has passed after 3 half lives?

a)

29 years

b)

87 years

c)

58 years

d)

116 years

7.
What is Half-life?
a)
The amount of time it takes for some of the nuclei in a sample of the isotope to decay
b)
The amount of time it takes for half the electrons in a sample of the isotope to decay
c)
The amount of time it takes for half the nuclei in a sample of the isotope to decay
d)
the amount of time it takes to double the nuclei in a sample of the isotope to decay
8.

What type of decay is shown here

23892U ---> 23490Th + 42He.

a)

alpha

b)

beta

c)

gamma

9.
After 4 half-lives, 1g of a sample of Krypton-85 remains unchanged.  What was the original mass of the sample?
a)
16g
b)
32g
c)
0.0625g
d)
4g
10.

Identify the type of nuclear decay shown here

21483Bi → 0-1e + 21484Po

a)

alpha

b)

beta

c)

gamma

11.

In the symbol 20682Pb what does 206 stand for?

a)

Mass number

b)

Atomic number

c)

Neutron number

d)

Number of protons

12.
What is the symbol for an alpha particle?
a)
42He
b)
0-1e
c)
0+1 e
d)
10n
13.

A sample of Radium-228 decays from 100g to 12.5g. How many half lives did it experience?

a)

1

b)

2

c)

3

d)

4

14.

How much of a 250g sample would be left after 5 half lives?

a)

125g

b)

62.5g

c)

31.25g

d)

7.81g

15.

If the half life of Uranium-240 was 10 years, how long would it take for it to decay from 310g to 80g?

a)

10 years

b)

240 years

c)

20 years

d)

30 years

16.

An isotope of an element has the same number of _________, but a different number of _________.

a)

Protons, electrons

b)

Protons, neutrons

c)

Electrons, neutrons

d)

Neutrons, protons

17.

Which type of radiation releases an electron?

a)

Alpha radiation

b)

Beta radiation

c)

Gamma radiation

d)

Theta radiation

18.

The % of the parent isotope remaining after 3 Half Lives.

a)

50%

b)

25%

c)

12.5%

d)

6.25%

19.

What is the Half life of this isotope?

a)

5 seconds

b)

10 seconds

c)

15 seconds

d)

20 seconds

20.

Which of the following is true about M?

a)

It is neutral

b)

Has high penetrating power

c)

Has high ionisation power

d)

Used to control thickness of metal

21.

The type of radioactive particle that can be stopped by a sheet of paper is the ____.

a)

alpha particle

b)

beta particle

c)

gamma ray

22.

The half-life of strontium-90 is 25 years. How much strontium-90 will remain after 100 years if the initial amount is 4.0 g?

a)

3.0 g

b)

0.25 g

c)

0.3 g

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