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WorksheetsRadiation
Total questions: 10
Worksheet time: 7mins
A radioactive nucleus emits either an α-particle or a β-particle. What are the products of these two types of radioactive emission?
α-emission is a nucleus of a different element, while β-emission is a nucleus of a different element.
α-emission is a nucleus of the same element ; β-emission is a nucleus of the same element.
α-emission is a nucleus of the same element ; β-emission is a nucleus of a different element.
α-emission is a nucleus of a different element ; β-emission is a nucleus of the same element.
Radioactive materials should be handled carefully.
Which safety precaution does not reduce the risk to people using a radioactive material?
keeping the material a long distance from people
keeping the material at a low temperature
using lead screening between the material and people
using the material for only a short time
A sample of a radioactive isotope has an initial rate of emission of 128 counts per minute and a half-life of 4 days. How long will it take for the rate of emission to fall to 32 counts per minute?
2 days
4 days
8 days
12 days
A scientist carries out an experiment using a sealed source which emits β-particles. The range of the β-particles in the air is about 30cm.Which precaution is the most effective to protect the scientist from the radiation?
handling the source with long tongs
keeping the temperature of the source low
opening all windows in the laboratory
washing his hands before leaving the laboratory
how is the nature of α-particles and of γ-rays
α-particles- helium nuclei
γ-rays- electromagnetic radiation
α-particles- helium nuclei
γ-rays- electrons
α-particles- protons
γ-rays- electromagnetic radiation
α-particles- protons
γ-rays- electrons
A radioactive substance has a half-life of 2 weeks. At the beginning of an investigation, a sample of the substance emits 3000 β-particles per minute.
How many β-particles will it emit per minute after 6 weeks?
0
375
500
1500
Compared with β-particles and γ-rays, α-particles
have the greatest penetrating effect.
have the greatest ionising effect.
have the smallest mass.
are the only type of radiation to carry a charge.
In a cathode-ray tube, a hot tungsten cathode releases particles by thermionic emission.
What are these particles?
Electrons
tungsten atoms
protons
α-particles
A radioactive substance emits a particle from the nucleus of one of its atoms. The particle consists of two protons and two neutrons.
What is the name of this process?
nuclear fission
γ-emission
α-emission
β-emission
Why are some radioactive sources stored in boxes made from lead?
Lead decreases the half-life of radioactive sources.
Lead absorbs emissions from the radioactive sources.
Lead repels emissions from the radioactive sources
Lead increases the half-life of radioactive sources.
