Spectra and Electromagnetic Waves

These flashcards cover key concepts from the lecture on light spectra and electromagnetic waves, aiding in exam preparation.

Light spectra

Unique spectra created when atoms, ions or molecules absorb and emit specific wavelengths (or energies) of light, acting as a fingerprint for species identification.

Wavelength (λ)

The distance between two consecutive peaks or troughs in a wave, typically measured in meters (m) or nanometers (nm).

Frequency (ν or )

How many wave crests or troughs pass a point in one second, measured in Hertz (Hz).

Energy (E)

The amount of energy carried by a single wave, typically measured in Joules (J).

Inversely proportional

A relationship where one variable increases while the other decreases; for example, as wavelength increases, energy decreases.

Visible spectrum

The range of wavelengths of light that are visible to the human eye, ranging from red (lowest energy) to violet (highest energy).

Equations of EM waves

The three equations used for calculating wave properties: c = λ * ν, E = h * ν, E = h * c/λ.

Planck’s constant (h)

A fundamental constant used in quantum mechanics, approximately equal to 6.626 x 10^-34 J*s.

Photon

A particle of light representing a quantum of electromagnetic radiation.

Einstein (in the context of light)

A mole of light waves, equivalent to 6.022 x 10^23 photons.