1 markWhich of the following statements does not help to explain why electrons can be used to probe the nuclei of atoms?
Electrons can be accelerated to high energies.
Electrons can be part of an atom.
Electrons can exhibit diffraction effects.
Electrons can have wavelengths similar in size to nuclear diameters.
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1 mark
is an isotope of oxygen.
Which row of the table gives the number of nucleons and the number of neutrons in an atom of ?
| Number of nucleons | Number of neutrons |
A | 8 | 8 |
B | 8 | 9 |
C | 17 | 8 |
D | 17 | 9 |
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1 markThe diagram shows some of the components in a cathode ray tube.
Electrons are released from the heated metal filament.
Which of the following is the name of this process?
ionisation
photoelectric emission
relativistic effect
thermionic emission
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1 markThe diagram shows some of the components in a cathode ray tube.
When a potential difference is applied across the parallel metal plates, the electrons are deflected.
Which of the following changes would decrease the deflection of the electrons?
increasing the current in the metal filament
increasing the distance between the plates
increasing the length of the plates
increasing the potential difference across the plates
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1 markIn the early 20th century experiments were carried out to measure the scattering of alpha particles after striking thin gold foil.
Which of the following could not be concluded from the results of these experiments?
The nucleus is charged.
The nucleus contains most of the mass of the atom.
The nucleus contains neutrons and protons.
The nucleus is very small compared to the atom.
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1 markA charged particle is accelerated in a spiral path in a cyclotron.
Which of the following changes would increase the amount of energy transferred to the particle as it travels through 360°?
increasing the distance between the dees
increasing the frequency of the potential difference across the dees
increasing the strength of the magnetic field within the dees
increasing the maximum potential difference across the dees
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1 markThe structure of nucleons can be investigated using electrons with high energies.
Which of the following is the reason why high energies are required?
to allow for the creation of new particles
to overcome the repulsive electrostatic forces
to produce a relativistic increase in particle lifetime
to produce short de Broglie wavelengths
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