Ernest Rutherford came up with the 'Plum Pudding' model.
In 1909, Rutherford tried firing alpha particles at thin gold foil to see what happened.
Most of the alpha particles in Rutherford's experiment went straight through the gold foil. What did Rutherford figure out from this?
Gold is mostly empty space.
The nucleus of an atom is very small compared to the rest of it.
There are positive particles in the atom.
Alpha particles cannot travel very far.
Some of the alpha particles in Rutherford's experiment deflected when they through the gold foil. What did Rutherford figure out from this?
A few of the alpha particles in Rutherford's experiment bounced straight back from the gold foil. What did Rutherford figure out from this?
Rutherford's idea was only accepted after his death.
Radioactive decay is a random process.
Which type of radiation is a fast moving electron?
Gamma
Delta
Alpha
Beta
Beta radiation is the only type of radiation that is not a particle.
What type of radiation has an unlimited range in air?
Paper can stop alpha particles.
Which type of radiation has the same structure as a helium nucleus?
Alpha particles pose no risk to humans.
What type of radiation source do many people have in their homes?
Alpha particles can only travel a few centimetres in air.
What is the relative charge and relative mass of an alpha particle?
Relative charge: +4 Relative mass: 4
Relative charge: -1 Relative mass: 0
Relative charge: +2 Relative mass: 0
Relative charge: +2 Relative mass: 4
What is the relative charge and relative mass of a beta particle?
Relative charge: -2 Relative mass: 0
Gamma radiation is uncharged and has no mass.
What is the range of beta radiation in air?
1 metre
5 metres
50 metres
5 centimetres
Alpha is the most ioning type of radiation.
Beta radiation is easily deflected by a magnetic field as it is a fast moving electron.
Which of these is NOT a definition of half-life?
The average weight of a certain amount of nuclei in a radioactive isotope sample after it has halved.
The time it takes for the activity of a sample to halve.
The time it takes for the count rate of a sample to halve.
The average time it takes for the number of nuclei in a radioactive isotope sample to halve.
The half-life of a particular isotope varies.
The half-lives of different isotopes range from seconds to many millions of years.
What is the half-life of Carbon-14?
5,700 years
570 years
57 years
5.7 years
What type of radiation and what length of half-life is needed for a radioactive tracer?
Gamma radiation, long half-life
Beta radiation, short half-life
Gamma radiation, short half-life
Alpha radiation, short half-life
What type of radiation and what length of half-life is needed for a smoke alarm?
Beta radiation, long half-life
Alpha radiation, long half-life