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R_Activity
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1995-10-16
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@Alpha particles are:
Atomic nuclei
Electrons
Electromagnetic waves
@Two samples of a radioactive isotope are shown. Which one of the following is the same for BOTH samples?
#isotope
Half-life
Number of atoms
Amount of emitted radiation
@Two samples of a radioactive isotope are shown. Which of the following statements is INCORRECT?
#isotope
The amount of emitted radiation by each sample is the same
The half-life of each sample is the same
The numbers of protons in the nucleus of an atom, in each sample, is equal
@Beta particles are:
Electrons
Atomic nuclei
Neutral atoms
@Gamma rays are:
Electromagnetic waves
Atomic nuclei
Electrons
@Which one of the following has the most mass?
Alpha particles
Beta particles
Gamma rays
@Which one of the following produces the least amount of ionisation?
Gamma rays
Beta particles
Alpha particles
@The following radiations were put through a magnetic field. Which is in the correct order of increasing deflection?
Gamma, alpha and beta
Alpha, beta and gamma
Beta, gamma and alpha
@In a cloud chamber the tracks of alpha particles are:
Long and straight
Short and curved
Totally invisible
@The graphs show how the activity falls over time for three samples. Which sample has the shortest half life?
#halflife
Sample X
Sample Y
Sample Z
@The graphs show how the activity falls over time for three samples. Which sample has the longest halflife?
#halflife
Sample Y
Sample Z
Sample X
@In air beta particles have a range of about:
1m
1mm
1cm
@If the following were allowed to pass near a charged gold leaf electroscope, which would produce the greatest effect?
Alpha radiation
Beta radiation
Gamma radiation
@Which one of the following is also an electromagnetic wave?
Gamma rays
Alpha particles
Beta particles
@An atom becomes ionised when:
it loses electrons
it loses neutrons
it loses protons
@Radioactivity was first discovered about:
1900
1800
1700
@What is background radiation?
Natural radiation from rocks and space
Radiation from early atomic experiments
Fallout from nuclear accidents
@Alpha particles are the nuclei of what gas?
Helium
Hydrogen
Argon
@What radiation needs thick lead to stop it?
Gamma
Alpha
Beta
@Which type of radiation is affected by thin card?
Alpha
Beta
Gamma
@Why is a G-M tube (Geiger-Muller) poor at detecting alpha radiation?
The radiation can't easily pass through the 'window' of the tube
Alpha particles produce little or no ionisation
G-M tubes are not really designed to detect ions
@Which form of radiation also has a negative charge?
Beta
Alpha
Gamma
@Which form of radiation also has a positive charge?
Alpha
Beta
Gamma
@Which form of radiation has no charge?
Gamma
Alpha
Beta
@What are isotopes?
Atoms which are chemically the same, but have different mass
Atoms which have different numbers of protons in their nucleus
Atoms that have lost their outer electrons
@A neutron hits a Uranium atom, which splits, and produces more neutrons. What form of energy do the neutrons have?
#u235
Kinetic energy
Potential energy
Electrical energy
@A neutron hits a Uranium atom, which splits, and produces more neutrons. This kind of reaction is called a:
#u235
Chain reaction
Continuous reaction
Redox reaction
@A neutron hits a Uranium atom, which splits, and produces more neutrons. The two new atoms are:
#u235
Usually radioactive
Helium nuclei
Harmless isotopes of Uranium
@A fast moving alpha particle approaches a gold atom. What happens?
#gold
It 'bounces' back from the gold atom
It is absorbed by the gold atom
It passes through the nucleus
@A cloud chamber produces the tracks shown. After five minutes:
#cloud1
different tracks in different places will be seen
the same tracks in exactly the same places will be seen, only shorter
the same tracks will be seen, only much thicker