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5.1.1. The atom
A subsection of Physics, 5054, through 5. Nuclear physics
Listing 10 of 23 questions
Isotope X is radioactive. It decays by alpha-particle emission to a stable isotope. State how a nucleus of X changes when it emits an alpha-particle. There is a radiation detector in a laboratory where there are no radioactive samples. The detector is switched on and shows an average count rate of 22 counts / minute. State why the radiation detector shows a count rate. A sample of isotope X is placed 2 cm from the detector and the reading displayed is 8000 counts / minute. The sample is moved a distance of 10 cm from the detector. The reading returns to an average value of 22 counts / minute. Explain why the reading returns to the original value. An alpha-particle passes into a region where there is a magnetic field. In the magnetic field, a force acts on the alpha-particle so that it follows a circular path. shows that the particle passes through point J. path of alpha particle magnetic field J On , draw an arrow through point J to show the direction of the force on the alpha-particle at J. Determine the direction of the magnetic field and mark a tick in the box (✓) that indicates this direction. to the left to the right towards the top of the page towards the bottom of the page into the page out of the page Explain whether this force does work on the alpha-particle as the particle moves along the circular path.
5054_w21_qp_22
THEORY
2021
Paper 2, Variant 2
View
Questions Discovered
23