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MMLU-Pro / 9717 / A very slow-moving positron interacts with a stationary electron. Which of the…

Problem

Answer published by the source. Consult the official source to check your work against its answer.

question

A very slow-moving positron interacts with a stationary electron. Which of the following statements correctly describes a possible outcome of this reaction and why it would occur?

category

physics

options

  1. Conservation of momentum suggests that the reaction could result in three identical gamma rays moving in different directions.
  2. Conservation of mass indicates that if a single new particle were created in the reaction, it must have a total mass equal to the combined masses of the electron and positron.
  3. Conservation of momentum indicates that two identical gamma rays moving off in opposite directions could be created.
  4. Conservation of mass indicates that the reaction could not occur as the masses of the electron and positron are too different.
  5. Conservation of energy indicates that the reaction would result in the positron gaining momentum and the electron remaining stationary.
  6. Conservation of charge indicates that the reaction would create a new particle with a positive charge.
  7. Conservation of mass indicates that the reaction would result in the creation of a new particle with a mass larger than the combined masses of the electron and positron.
  8. Conservation of charge indicates that all new particles created in the reaction would have no electric charge.
  9. Conservation of energy indicates that the antimatter positron could annihilate into energy, leaving the stationary electron behind.
  10. Conservation of energy indicates that the reaction would result in the creation of a single gamma ray.

src

ori_mmlu-high_school_physics

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Source and history

upstream_id / Original problem ID
9717
task_id
8f4b0d90-268e-510c-84ae-a3744de4d698
task_key
default--test--9717
task_revision_id
1
config / split
default / test

Official source

initial import