THE END PHYSICS

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Last updated 8:26 AM on 4/22/26
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67 Terms

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alpha (radiation)

alpha particle; a free helium nucleus: two protons and two neutrons

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alpha (radiation) unit

charge: +2

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alpha particle; a free helium nucleus: two protons and two neutrons unit

charge: +2

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beta -

beta particle; a free electron

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beta - unit

charge: -1

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beta particle; a free electron unit

charge: -1

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beta +

beta anti-particle; a free positron

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beta + unit

charge: +1

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beta anti-particle; a free positron unit

charge: +1

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Y

gamma particle ; a free high-energy photon

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Y unit

charge: 0

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gamma particle ; a free high-energy photon unit

charge: 0

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lambda (decay)

decay constant

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lambda (decay) unit

s^-1

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decay constant unit

s^-1

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t(v1/2)

half-life

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t(v1/2) unit

s

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half-life unit

s

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N (decay)

number of particles

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number of particles

N (decay)

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E (nuclear)

energy from converted mass

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E (nuclear) unit

J or MeV

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energy from converted mass unit

J or MeV

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m (nuclear)

mass defect: expected mass - actual mass

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m (nuclear) unit

kg or amu

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mass defect: expected mass - actual mass unit

kg or amu

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c

speed of light in a vacuum

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c unit

m/s

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speed of light in a vacuum unit

m/s

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c ec

3 × 10^8 m/s

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E (modern)

energy of a photon

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E (modern) unit

J or eV

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energy of a photon unit

J or eV

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E (modern) ec

1 eV = 1.60 × 10^-19 J

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h

Planck’s constant; quantizes energy and momentum

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Planck’s constant; quantizes energy and momentum

h

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h ec

6.63 × 10^-34 Js

4.14 × 10^-15 eVs

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f (modern)

frequency of light/photon

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f (modern) unit

Hz

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frequency of light/photon unit

Hz

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phi (modern)

work function: minimum energy for photon to eject an electron

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phi (modern) unit

J or eV

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work function: minimum energy for photon to eject an electron unit

J or eV

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K (vmax)

maximum energy of photoelectrons

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K (vmax) unit

J or eV

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maximum energy of photoelectrons unit

J or eV

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p (modern)

momentum of a photon

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p (modern) unit

kgm/s

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momentum of a photon unit

kgm/s

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lambda (modern)

de Broglie wavelength

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lambda (modern) unit

m

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de Broglie wavelength unit

m

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b

Wien’s constant

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Wien’s constant

b

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b ec

2.90 × 10^-3 mK

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T (modern)

absolute temperature

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T (modern) unit

K

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absolute temperature unit

K

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P (modern)

rate at which energy is emitted by a blackbody

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P (modern) unit

W or J/s

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rate at which energy is emitted by a blackbody unit

W or J/s

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A (modern)

surface area of a blackbody

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A (modern) unit

m²

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surface area of a blackbody unit

m²

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sigma (modern)

Stefan-Boltzmann constant

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Stefan-Boltzmann constant

sigma (modern)

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sigma (modern) ec

5.67 × 10^-8 W/m²K^4