Oracle
A free proton is heavier than a free neutron. Answer true or false.
Answer
false
- mass
- Free proton and neutron mass means their rest mass; compare the standard CODATA particle masses.
- sources
- physics.nist.gov, codata 2018 recommended values (nist): proton mass = 938.27208816 mev/c^2; neutron mass = 939.56542052 mev/c^2 (https://physics.nist.gov/cgi-bin/cuu/value?mnc2mev, https://physics.nist.gov/cgi-bin/cuu/value?mnc2mev|search_for=neutron+mass), codata 2018 recommended values / nist physical reference data: proton mass 938.27208943(29) mev, neutron mass 939.56542194(48) mev, codata 2018 recommended values for proton and neutron rest mass (m_p = 938.27208816 mev/c^2, m_n = 939.56542052 mev/c^2), codata 2018 recommended values of physical constants (proton mass 938.27208943(29) mev, neutron mass 939.56542194(48) mev), as tabulated by nist/pdg, codata 2018 recommended values of the fundamental physical constants (nist), codata 2018 recommended values of the fundamental physical constants (nist): proton mass 938.27208816(29) mev, neutron mass 939.56542052(54) mev, codata 2018 recommended values of the fundamental physical constants (physics.nist.gov): proton mass 1.67262192369e-27 kg vs neutron mass 1.67492749804e-27 kg — the neutron is heavier than the proton, so the statement is false., codata 2018 recommended values of the fundamental physical constants (physics.nist.gov): proton mass 938.27208816(29) mev, neutron mass 939.56542052(54) mev, codata 2018 recommended values of the fundamental physical constants (physics.nist.gov/cuu/constants), proton mass 938.27208943 mev/c^2 and neutron mass 939.56542194 mev/c^2, codata 2018 recommended values of the fundamental physical constants: proton mass = 938.27208816 mev/c^2, neutron mass = 939.56542052 mev/c^2 (physics.nist.gov/cuu/constants), codata 2018 recommended values: proton mass 1.67262192369(51)e-27 kg (938.27208816 mev/c^2); neutron mass 1.67492749804(95)e-27 kg (939.56542052 mev/c^2), as published by nist (physics.nist.gov/cuu/constants), codata 2018 recommended values: proton mass 1.67262192369e-27 kg, neutron mass 1.67492749804e-27 kg (physics.nist.gov/cgi-bin/cuu/value?mn), codata 2018 recommended values: proton mass 1.67262192369e-27 kg; neutron mass 1.67492749804e-27 kg, codata 2018 recommended values: proton mass 1.67262192369e-27 kg; neutron mass 1.67492749804e-27 kg (physics.nist.gov/cgi-bin/cuu/value?mp|mn), codata 2018 recommended values: proton mass 938.27208816 mev/c^2 (1.67262192369e-27 kg); neutron mass 939.56542052 mev/c^2 (1.67492749804e-27 kg), codata 2018 recommended values: proton mass 938.27208816 mev/c^2, neutron mass 939.56542052 mev/c^2, codata 2018 recommended values: proton mass 938.27208816 mev/c^2, neutron mass 939.56542052 mev/c^2 (physics.nist.gov/cgi-bin/cuu/value?mpc2 and value?mnc2), codata 2018 recommended values: proton mass 938.27208816 mev/c^2; neutron mass 939.56542052 mev/c^2 (nist physics.nist.gov/cuu/constants), codata 2018 recommended values: proton mass 938.27208816 mev/c^2; neutron mass 939.56542052 mev/c^2 (physics.nist.gov/cgi-bin/cuu/value), codata 2018 recommended values: proton mass 938.27208816(29) mev/c^2, neutron mass 939.56542052(54) mev/c^2 (particle data group, pdg.lbl.gov), codata 2018 recommended values: proton mass 938.27208816(29) mev/c^2, neutron mass 939.56542052(54) mev/c^2 (physics.nist.gov/cgi-bin/cuu/value), codata 2018 recommended values: proton mass 938.27208816(29) mev/c^2; neutron mass 939.56542052(54) mev/c^2, codata 2018 recommended values: proton mass 938.27208816(29) mev/c^2; neutron mass 939.56542052(54) mev/c^2 (nist physical reference data, physics.nist.gov/cuu/constants), codata 2018 recommended values: proton mass = 938.27208816(29) mev/c^2; neutron mass = 939.56542052(54) mev/c^2 (also reported by the particle data group). the free proton is lighter than the free neutron by about 1.293 mev/c^2., codata 2018 recommended values: proton mass m_p = 1.67262192369(51)e-27 kg (938.27208816 mev/c^2); neutron mass m_n = 1.67492749804(95)e-27 kg (939.56542052 mev/c^2), codata 2018 recommended values: proton rest mass = 1.67262192369e-27 kg (938.27208816 mev/c^2); neutron rest mass = 1.67492749804e-27 kg (939.56542052 mev/c^2), codata 2018/2022 recommended values of fundamental physical constants (physics.nist.gov): proton mass 1.67262192369e-27 kg vs neutron mass 1.67492749804e-27 kg, codata 2018/2022 recommended values of fundamental physical constants: proton mass 938.27208943(29) mev/c^2, neutron mass 939.56542194(48) mev/c^2 (physics.nist.gov/cuu/constants), codata 2018/2022 recommended values: proton mass 938.27208816 mev/c^2 (1.67262192369e-27 kg); neutron mass 939.56542052 mev/c^2 (1.67492749804e-27 kg). the neutron is heavier than the proton, so a free proton is not heavier than a free neutron., codata 2018/2022 recommended values: proton mass 938.27208816(29) mev/c^2, neutron mass 939.56542052(54) mev/c^2 (nist fundamental physical constants), codata 2018/2022 recommended values: proton mass = 938.27208816(29) mev/c^2, neutron mass = 939.56542052(54) mev/c^2, codata 2018/nist: proton mass 1.67262192369e-27 kg (938.27208816 mev/c^2); neutron mass 1.67492749804e-27 kg (939.56542052 mev/c^2). the neutron is heavier than the proton, so the statement 'a free proton is heavier than a free neutron' is false., codata 2018/pdg particle mass tables: proton mass = 938.27208816(29) mev/c^2; neutron mass = 939.56542052(54) mev/c^2. the neutron is heavier than the proton by about 1.293 mev/c^2, which is why a free neutron beta-decays into a proton (plus electron and antineutrino) and not the reverse., codata 2022 / pdg: proton mass 938.27208943 mev/c^2, neutron mass 939.56542194 mev/c^2, codata 2022 recommended values of the fundamental physical constants (physics.nist.gov), codata/nist fundamental physical constants: proton mass 938.27208943 mev/c^2, neutron mass 939.56542194 mev/c^2, codata/nist fundamental physical constants: proton mass = 938.27208943(29) mev/c² (1.67262192595(52)e-27 kg); neutron mass = 939.56542152(54) mev/c² (1.67492750056(85)e-27 kg). pdg review of particle physics lists the same values. the neutron is about 1.29333 mev/c² (0.14%) heavier than the proton., codata/nist physical reference data - fundamental physical constants (proton mass 938.27208943 mev; neutron mass 939.56542194 mev), en.wikipedia.org, nist codata 2018 fundamental physical constants (physics.nist.gov/cgi-bin/cuu/value?mp and value?mn), nist codata 2018 fundamental physical constants, https://physics.nist.gov/cgi-bin/cuu/value?mnc2mec2 and https://physics.nist.gov/cgi-bin/cuu/value?mp, nist codata 2018 fundamental physical constants: proton mass 938.27208943(29) mev, neutron mass 939.56542194(48) mev (https://physics.nist.gov/cgi-bin/cuu/value?mpc2mev, https://physics.nist.gov/cgi-bin/cuu/value?mnc2mev), nist codata 2018: proton mass 938.27208816 mev/c^2; neutron mass 939.56542052 mev/c^2 (physics.nist.gov/cgi-bin/cuu/value?mp and value?mn), nist codata 2022 recommended values: proton mass 1.67262192595(52)e-27 kg; neutron mass 1.67492750056(85)e-27 kg (physics.nist.gov/cgi-bin/cuu/value?mp and value?mn), nist codata 2022, neutron-proton mass ratio (mn/mp = 1.00137841946): https://physics.nist.gov/cuu/pdf/all.pdf, nist codata fundamental physical constants (physics.nist.gov/cgi-bin/cuu/value), proton mass and neutron mass energy equivalent entries, nist codata fundamental physical constants (physics.nist.gov/cgi-bin/cuu/value?mp and value?mn), nist codata fundamental physical constants (physics.nist.gov/cuu/constants), proton and neutron rest mass values, nist codata fundamental physical constants: proton mass = 1.67262192595e-27 kg; neutron mass = 1.67492750056e-27 kg (https://physics.nist.gov/cgi-bin/cuu/value?mp, https://physics.nist.gov/cgi-bin/cuu/value?mn), nist, 2022 codata adjustment, fundamental physical constants—extensive listing: neutron-proton mass difference (mn − mp) = 2.30557461(67) × 10^-30 kg; https://physics.nist.gov/cuu/pdf/all.pdf, nist, 2022 codata adjustment, reporting the neutron-proton mass difference m_n − m_p as positive: https://physics.nist.gov/cuu/pdf/all.pdf, nist/codata 2022 recommended constants: proton-neutron mass ratio m_p/m_n = 0.99862347797(40), https://physics.nist.gov/cuu/pdf/jpcrd2022codata.pdf, nist/codata 2022, recommended values of the fundamental physical constants, proton-neutron mass ratio mp/mn = 0.99862347797(40), https://physics.nist.gov/cuu/pdf/jpcrd2022codata.pdf. since the ratio is less than 1, a free proton is lighter than a free neutron., openstax.org, pdg.lbl.gov, pdglive.lbl.gov, pdgprod.lbl.gov, pdgprod.pdg.lbl.gov, pml.nist.gov, tsapps.nist.gov, www.physics.nist.gov
Work
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#613falsefrom physics.nist.gov
#1202falsefrom pdglive.lbl.gov
#1545falseCODATA 2018 recommended values of the fundamental physical constants (physics.nist.gov): proton mass 938.27208816(29) MeV, neutron mass 939.56542052(54) MeV
#443falseCODATA 2018 recommended values: proton rest mass = 1.67262192369e-27 kg (938.27208816 MeV/c^2); neutron rest mass = 1.67492749804e-27 kg (939.56542052 MeV/c^2)
#1129falsefrom physics.nist.gov212 more
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