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WorksheetsP4. Radioactivity
Total questions: 20
Worksheet time: 13mins
What was discovered that led JJ Thomson to come up with his model for the atom?
the proton
the neutron
the nucleus
the electron
Which of these is false:
Protons have a relative mass of 1
Electrons have a relative mass of 0
Neutrons have the same mass as protons
Electrons have a relative mass close to 0
What is an isotope?
An atom with the same atomic mass but a different atomic number
Atoms of the same element with different numbers of electrons
Atoms of the same element with different atomic masses
Atoms with no electrons
Ernst Rutherford's alpha particle scattering experiment (sometimes called Gold Leaf experiment) discovered what:
Protons
The nucleus
Neutrons
Electrons
What was the evidence Rutherford's experiment provided to suggest the nucleus was SMALL
Most of the radiation went straight through the foil
Some of the radiation was deflected at an angle.
A very small amount of radiation was deflected back to the source
How many PROTONS does the atom in the image have?
(a)
How many NEUTRONS does the atom in the image have?
(a)
Which type of radioactive decay has no mass, and travels at (or close to) the speed of light.
Alpha
Beta
Gamma
Which type of radioactive decay has the same structure as a helium nuclei
Alpha
Beta
Gamma
Carbon-14 becomes more stable with the release of a beta particle, and a different nuclei remains. What is the new nuclei?
Boron
Carbon
Nitrogen
Oxygen
What is a half-life? (there might be more than one answer)
the amount of time for half of the nuclei to disappear
the amount of time for the activity of a substance to decrease by a half
half the length of time a substance will last
the amount of time for the number of radioactive nuclei to decrease by a half.
What percentage of a substance will be left after 3 half-lives?
(a)
A substance had a count of 600 counts per minute. And a half life of 4 hours. How long will it take for the count to decrease to less than 150.
(a)
A different substance has a half life of 15s, and an initial count rate of 500 counts/min. What is the count rate after 1 minute?
(a)
Some foods are irradiated with gamma radiation to kill microbes and allow the foods to last longer. Why is this not dangerous?
It is dangerous
It uses low doses
It does not come into contact with the radiation.
Which of these protect from BOTH contamination and irradiation
Long tongs
Gloves
Face mask
Which form of radioactive decay would cause more health concerns if inside the body?
Alpha
Beta
Gamma
Why is alpha radiation not as harmful outside the human body
It is less ionising- it can't do anything dangerous
It is less penetrating- it cant even penetrate our skin
The central part of the atom which contains the protons and neutrons is better known as the...
(a)
What form of radiation is emitted by a nuclei with too many neutrons?
Alpha
Beta
Gamma
