RAdioactivity1

• Natuurkunde
• Middelbare school
• havo
• Leerjaar 3

Gamma radiation can be significantly reduced by...

1. A sheet of paper
2. A 3 mm thickness of aluminium
3. Several cm of lead
4. None of the answers

1. 86.4
2. 48.6
3. 8
4. 104.34

Which type of decay involves the emission of an alpha particle?

1. Beta decay
2. Neutron decay
3. Alpha decay
4. Gamma decay

In a sample, if the half-life of a radioactive isotope is 10 years, how much of the original material will be left after 30 years?

1. 1/2
2. 1/8
3. 1/4
4. 1/3

1. 245
2. 874
3. 464
4. 1042

Which of the following is not a factor affecting half-life?

1. Nature of the substance
2. Presence of catalysts
3. Pressure
4. Temperature

What is the definition of half-life?

1. The time taken for an element to transform into another.
2. The time taken for a substance to decompose completely.
3. The time taken for the radioactivity of a specified isotope to fall to half its original value.
4. The time taken for a chemical reaction to occur.

Gamma radiation is...

1. A helium nucleus
2. An electron
3. An electromagnetic wave
4. None of the answers

Which form of radiation has the highest ionising power?

1. Gamma
2. Beta
3. Alpha
4. Beta and Gamma

What causes an atom's nucleus to become unstable?

1. Too many or too few neutrons in the nucleus
2. More electrons than protons
3. Fewer electrons than protons
4. Fewer protons

What is the activity of a source that emits 1,200 particles per minute?

1. 20 Bq
2. 1200 Bq
3. 72,000 Bq
4. 720,00 Bq

Which type of radiation has the greatest range in air?

1. Alpha
2. Beta
3. Gamma
4. Alpha and Beta

What is the half-life of a radioactive source?

1. Half the age of the source
2. The time taken for the activity of the source to fall to half the original activity
3. Half the time taken for the activity of the source to fall to zero
4. All the answers are correct

A radioactive source has an activity of 3600 Bq and a half-life of 14 days. What is the activity of the source 42 days later?

1. 450 Bq
2. 900 Bq
3. 1200 Bq
4. 1800Bq

Calculate the frequency of infrared radiation with a wavelength of 0,01 cm

Use the graph to calculate the half life of a sample.

A radioactive sample has a count rate of 10,000 Bq. 24 days later the activity has fallen to 625 Bq. What is the half-life of the sample?

1. 4 days
2. 6 days
3. 12 days
4. 8 days

Wright the decay equation for:
a Plutonium -242(Pu-242)
b Carbon-14 (C-14)

What is the atomic number of an element.

What is the smallest unit of an element?

1. Compound
2. Molecule
3. Cell
4. Atom

Who proposed the plum pudding model of the atom?

1. Niels Bohr
2. Ernest Rutherford
3. J.J. Thomson
4. John Dalton

What is the charge of a proton?

1. +1
2. -1
3. 0
4. +2

Which subatomic particle has a negative charge?

1. Positron
2. Electron
3. Neutron
4. Proton

What is the atomic number of an element?

1. Atomic mass
2. Number of protons
3. Total number of particles
4. Number of neutrons