Electromagnetic Spectrum

Exam 3, chem 115, WVU fall '25

C

speed of light: 3 × 10⁸

λ

wavelength (m)

v

frequency (waves/s OR Hz)

When doing calculations, multiply v by __

10⁻⁹

E

energy

Important equation 1

C = λ v

Important equation 2

E = (hc) / λ

Nano

10⁻⁹

Rydberg equation: use

predicts the theoretical spectrum of hydrogen

Rydberg equation: formula

1/λ = R [1/(n1)² - 1/(n2)²]

deBroglie wavelength: formula

λ = h / (mv)

m

mass (kg)

V (for deBroglie and Heisenberg)

velocity (m/s)

X (for Heisenberg’s uncertainty principle)

distance (m)

Heisenberg’s Uncertainty Principle

(ΔX) [Δ (mv)] ≥ h / 4π