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Checkpoint: Half-life and radioactive decay

Total questions: 21

Worksheet time: 56mins

Name
Class
Date
1.

You have 100 grams of radioactive C-14. The half life of C-14 is 5730 years.

How many grams are left after 1 half life?

a)

100 grams

b)

25 grams

c)

2 grams

d)

50 grams

2.

Imagine you have 50,000 atoms of uranium-238. If U-238 has a half-life of 4.5 billion years, how many U-238 atoms will be left after 4.5 billion years?

a)

25,000

b)

50,000

c)

12,500

d)

0

3.

If 10 mg of iodine 131 is given to a patient, how much is left after 24 days? The half-life of iodine-131 is 8 days.

a)

1.25mg

b)

1.25g

c)

10g

d)

10mg

4.

What percent of carbon-14 would be left after 5730 years?

a)

100%

b)

75%

c)

50%

d)

25%

5.

What is the half-life of iodine-131?

a)

32 days

b)

8 days

c)

16 days

d)

24 days

6.

The time it takes for a radioactivity level to drop by a half is is the sample's ___________________.

a)

quarter life

b)

whole life

c)

wonderful life

d)

half life

7.

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?

a)

1 half-life

b)

2 half-lives

c)

3 half-lives

d)

4 half-lives

8.

Which is an alpha particle

a)

Fast moving electron

b)

4 2 He nuclei

c)

fast moving positron

d)

EM wave

9.

What stops beta radiation

a)

Paper

b)

Air

c)

Glass

d)

Aluminium 3mm or thicker

10.

Identify the type of nuclear decay shown here

21483Bi → 0-1e + 21484Po

a)

alpha

b)

beta

c)

gamma

11.
When a nucleus undergoes nuclear decay by gamma rays, the atomic number of the element....
a)
remains the same
b)
  decreases by one.
c)
increases by one.
d)
increases by two.
12.
The three types of nuclear radiation in increasing order of penetrating power are ____.  
a)
  alpha, beta, gamma 
b)
X ray, beta, gamma
c)
alpha, gamma, beta 
d)
X ray, gamma, beta 
13.
Name the instrument used to detect radioactivity.
a)
voltmeter
b)
ohmeter
c)
seismograph
d)
geiger counter
14.
Is the process in which an unstable atomic nucleus emits charged particles and energy 
a)
radioactivity 
b)
radioisotope
c)
beta decay
d)
background radiation 
15.
Any atom containing an unstable nucleus is called
a)
radioisotope
b)
unisotope
c)
particles
d)
nuclei
16.
True or False:  During nuclear decay atoms of one element can change into atoms of a different element altogether. 
a)
True
b)
False
17.
This is the type of radiation that naturally occurs in the environment and is generally safe.
a)
background radiation
b)
environment radiation
c)
ionizing radiation
18.
What makes something radioactive?
a)
elements with an atomic number above 81
b)
an unstable nucleus
c)
contaminated sewage
d)
It decays over time
19.

Which type of nuclear radiation can be stopped by a sheet of paper?

a)

Alpha

b)

Beta

c)

Gamma

20.

Which type of radiation releases an electron?

a)

Alpha radiation

b)

Beta radiation

c)

Gamma radiation

d)

Theta radiation

21.
Which type(s) of radiation would be affected by a magnet?
a)
alpha only
b)
beta only
c)
alpha and beta
d)
gamma only

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