5.1.1. The atom
A subsection of Physics, 0625, through 5. Nuclear physics
Listing 10 of 85 questions
Use 11 shows the paths of three α-particles moving towards a thin gold foil. A B C gold foil Particle A is moving directly towards a gold nucleus. Particle B is moving along a line which passes close to a gold nucleus. Particle C is moving along a line which does not pass close to a gold nucleus. On , complete the paths of the α-particles A, B and C. State how the results of such an experiment, using large numbers of α-particles, provides evidence for the existence of nuclei in gold atoms.
0625_s07_qp_3
THEORY
2007
Paper 3, Variant 0
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In a laboratory experiment, the isotope uranium-238 is used as a source of α-particles. State one feature of uranium-238 nuclei that is the same for the nuclei of other uranium isotopes, one feature of uranium-238 nuclei that is different for the nuclei of other uranium isotopes. shows the α-particles from the uranium source being directed at a very thin gold foil, in a vacuum. thin gold foil uranium source _-particles vacuum moveable _-particle detector To investigate the scattering of α-particles, a detector is moved to different positions around the very thin gold foil and measurements are recorded. Describe the results from this scattering experiment and explain what they show about the structure of atoms.
0625_s13_qp_33
THEORY
2013
Paper 3, Variant 3
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shows a beam of α-particles moving towards a thin sheet of gold in a vacuum. beam of α-particles vacuum detectors gold sheet Detectors in the region surrounding the thin gold sheet detect the α-particles and determine the number of particles that travel in various directions. State and explain what can be deduced from the following observations. The majority of the α-particles pass through the gold sheet undeflected and are detected on the far side. deduction explanation A small number of α-particles are deflected as they pass through the gold sheet. deduction explanation A very small number of α-particles are deflected through very large angles or return back the way they came. deduction explanation A beam that consists of both α-particles and β-particles is passed through a region of space where there is a magnetic field perpendicular to the direction of the beam. State two ways in which the deflection of the α-particles differs from that of the β-particles. 1. 2.
0625_s19_qp_41
THEORY
2019
Paper 4, Variant 1
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Questions Discovered
85