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Lesson: Chapter - 19

Key Formulas

Time Dilation

Length Contraction

Addition of Relativistic Velocities

Relativistic Mass

Relativistic Kinetic Energy

Mass-Energy Equivalence

E = m0C2

Electron-Volts Related to Joules

1eV = 1.6 × 10-19J

Energy as a function of frequency

E = hƒ

Kinetic Energy of Liberated Photoelectron

KE = hƒ - F

Radius of Electron Orbit

Electron Potential Energy in a Hydrogen Atom

U = 1/n2(-13.6 eV)

De Broglie Wavelength

? = h/mv

De Broglie Wavelength for Electron

n? = 2?r

Heisenberg Uncertainty Principle

?x?p = h/4p

Atomic Mass Units in Kilograms

l amu = 1.6605 × 10-27 kg

Rate of Radioactive Decay

A = A0e>-?t
N = N
0e>

Half-Life of Radioactive Material

T1/2 = ln2/?

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