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Radioactivity PS

Total questions: 27

Worksheet time: 18mins

Name
Class
Date
1.

A particle consisting of two protons and two neutrons that is emitted from a decaying atomic nucleus is an:

a)

alpha particle

b)

beta particle

c)

tracer

d)

half-life

2.

A high-energy electron that is emitted when a neutron decays into a proton is a:

a)

beta particle

b)

alpha particle

c)

strong force

d)

tracer

3.

The amount of time it takes for half the nuclei in a sample of radioactive isotope to decay is:

a)

half-life

b)

strong force

c)

chain reaction

d)

tracer

4.

The process that occurs when a nucleus decays and emits matter and energy is:

a)

radioactivity

b)

chain reaction

c)

alpha particle

d)

transmutation

5.

The three types of nuclear radiation in order of increasing penetrating power are:

a)

alpha, beta, gamma

b)

alpha, gamma, beta

c)

beta, alpha, gamma

d)

gamma, alpha, beta

6.
Name the instrument used to detect radioactivity.
a)
voltmeter
b)
ohmeter
c)
seismograph
d)
geiger counter
7.
What makes something radioactive?
a)
elements with an atomic number above 81
b)
an unstable nucleus
c)
contaminated sewage
d)
It decays over time
8.
If the half life of a radioactive element is 100yrs, how long would it take for the radioactivity to reduce by one half?
a)
200yrs
b)
100yrs
c)
50yrs
d)
300yrs
9.

A certain radioactive sample has a half life of 2 years. After 6 years, how much of the sample is left?

a)

1/2

b)

1/3

c)

1/16

d)

1/8

10.

Which type of nuclear radiation can be stopped 60 cm of aluminum or 7 cm of lead?

a)

Alpha

b)

Beta

c)

Gamma

11.

A radioactive shoe is wrapped in 3mm of aluminum foil but radiation is still detected. What must be true?

a)

The shoe emits alpha radiation

b)

The shoe emits beta radiation

c)

The shoe emits gamma radiation

12.

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

13.

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

a)

125g

b)

62.5g

c)

31.25g

d)

7.81g

14.

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

15.
This particle determines what element you have - the elements identity.
a)
electron
b)
proton
c)
neutron
d)
valence shell
16.
Which particles make up the nucleus of an atom?
a)
protons and neutrons
b)
electrons and protons
c)
electrons, protons, and neutrons
d)
electrons and neutrons
17.

A radioactive nuclide has a ____ stable nucleus than a non-radioactive nucleus of the same element.

a)

more

b)

less

c)

identical

d)

small

18.

In order of greatest to least penetrating radiation we would have:

a)

Alpha , Beta, Gamma

b)

Beta , Gamma , Alpha

c)

Gamma, Beta, Alpha

d)

Gamma, Alpha, Beta

19.
Which type(s) of radiation would be affected by a magnet?
a)
alpha only
b)
beta only
c)
alpha and beta
d)
gamma only
20.

When nuclei decay, massive amounts of __________ is released.

a)

energy

b)

electrons

c)

protons

d)

neutrons

21.
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
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)
3.0g
b)
0.25mg
c)
0.3g
d)
0.25g
23.
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
d)
uranium
24.
The most dangerous type of radiation is the ____. 
a)
alpha particle
b)
gamma ray
c)
beta particle
d)
uranium
25.
Which is NOT a characteristic of gamma radiation?
a)
High energized photon of light
b)
Can be stopped by a sheet of aluminum foil
c)
Is the most harmful type of radiation to humans
d)
Our use of protection is concrete, or several inches of lead
26.

If the half life of iodine-131 is 8.1 days, how long will it take a 50.0 g sample to decay to 6.25 g?

a)

8.10 days

b)

16.2 days

c)

24.3 days

d)

32.4 days

27.

Potassium-42 has a half-life of 12.4 hours. How much of an 848 g sample of Potassium-42 will be left after 62.0 hours?

a)

26.5 g

b)

53 g

c)

106 g

d)

212 g

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