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Planck energy: Quiz

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Question 1: In the equations of ________, G is often multiplied by 8π.
General relativityBlack holeGravitationIntroduction to general relativity

Question 2: The ________ observed in 1991 had a measured energy of about 50 joules, equivalent to about 2.5×10−8 Ep.
Ultra-high-energy cosmic rayNeutrinoCosmic-ray observatoryGreisen–Zatsepin–Kuzmin limit

Question 3: Even so, Ep is a meaningful quantity in particle physics when ________ is taken into account.
Equivalence principleGravitationIntroduction to general relativityGeneral relativity

Question 4: Hence given Planck units, the ________ E = mc² simplifies to E = m, so that the Planck energy and mass are numerically identical.
Mass–energy equivalenceSpecial relativityPhotonLorentz ether theory

Question 5: In physics, the unit of energy in the system of natural units known as ________ is called the Planck energy, denoted by EP.
Metric systemPlanck unitsStoney scale unitsGeometrized unit system







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