Introduction to Quantum Mechanics and Atomic Structure

Flashcards covering historical atomic theory, wave properties, black body radiation, the photoelectric effect, and Bohr's model of the atom.

1927 Solvay Conference

A famous gathering of prominent scientists including Marie Curie, Max Planck, Albert Einstein, Werner Heisenberg, Niels Bohr, and Erwin Schrödinger, where they debated light as a particle versus a wave.

Electromagnetic Wave

A wave composed of two orthogonal oscillating parts: an electric component and a magnetic component.

Wavelength

The distance measured from peak to peak or trough to trough on a wave.

Frequency

The number of complete wave cycles that pass a point per second.

Speed of Light

A physical constant denoted as $c$, equal to $3 \times 10^8\text{ meters per second}$.

Amplitude

The height of a wave, which corresponds to the intensity or brightness of the light.

Constructive Interference

The phenomenon where two in-phase waves combine crest-to-crest to produce a wave of greater amplitude.

Destructive Interference

The phenomenon where two out-of-phase waves combine crest-to-trough, cancelling each other out to yield zero amplitude.

Diffraction

The bending or spreading of waves as they pass through a narrow slit, producing a characteristic interference pattern not observed in classical particles.

Black Body

A theoretical ideal object that absorbs all incoming electromagnetic radiation and emits radiation solely based on its temperature.

UV Catastrophe

The failure of classical physics to predict black body radiation behavior, incorrectly predicting that emitted energy would approach infinity at shorter ultraviolet wavelengths.

Max Planck

The physicist who resolved the UV catastrophe by proposing that energy emitted by vibrating atoms is quantized into discrete packets rather than being continuous.

Planck's Formula

The fundamental equation $E = h\nu$, relating photon energy $E$ to frequency $\nu$ via Planck's constant $h$.

Planck's Constant

A subatomic scaling constant $h$ approximately equal to $6.6 \times 10^{-34}$.

Photoelectric Effect

The emission of electrons from a metal surface when struck by light above a certain threshold frequency.

Threshold Frequency

The minimum frequency of incoming light required to overcome an electron's binding energy and eject it from a metal surface.

Photon

A discrete particle or quantum packet of light energy proposed by Albert Einstein to explain the photoelectric effect.

Bright Line Spectrum

An emission spectrum produced when excited atoms emit light at specific, quantized wavelengths rather than a continuous rainbow.

Absorption Spectrum

A spectrum showing dark lines where specific wavelengths of continuous white light are absorbed by sample atoms.

Bohr Model

An atomic model proposed by Niels Bohr where electrons orbit the nucleus in fixed, quantized paths determined by specific allowed angular momentum values.

Ground State

The lowest available energy state of an electron in an atom, positioned closest to the nucleus.

Excited State

An energy state where an electron has absorbed energy and moved to a higher principal orbital level above its ground state.