Waves, Interference, Standing Waves, and the Doppler Effect Vocabulary Flashcards

Vocabulary flashcards defining fundamental wave concepts, types of interference, standing wave components and harmonics, and the Doppler effect based on the lecture transcript.

Principle of Superposition

The principle stating that when two or more waves cross at a point, the displacement at that point is equal to the sum of the displacements of the individual waves.

Constructive Interference

Interference that occurs when two waves are in phase, producing a resultant amplitude equal to the sum of the individual wave amplitudes.

Destructive Interference

Interference that occurs when two waves are in antiphase, producing a resultant amplitude equal to the difference between the individual wave amplitudes.

Standing Wave

A vibrational wave pattern formed by the interference of two or more waves traveling along the same medium, characterized by stationary points.

Nodes

Points along a medium in a standing wave where there is no displacement or vibration due to destructive interference.

Antinodes

Points along a medium in a standing wave where the displacement is maximum due to constructive interference.

Harmonic

A standing-wave pattern corresponding to a particular frequency that is an integer multiple of the fundamental frequency.

Fundamental Frequency

The lowest frequency at which a standing wave can form, also known as the 1st harmonic.

First Overtone

The second harmonic ($f_2$) of a vibrating string, which contains 3 nodes and 2 antinodes.

Second Overtone

The third harmonic ($f_3$) of a vibrating string, which contains 4 nodes and 3 antinodes.

Third Overtone

The fourth harmonic ($f_4$) of a vibrating string, which contains 5 nodes and 4 antinodes.

Consecutive Node Distance

The spatial distance between two consecutive nodes or two consecutive antinodes in a standing wave, equal to $\frac{\frac{\text{wavelength}}{1}}{2}$ or $\frac{\tan(\theta)}{1}$, simplified to $\frac{\text{wavelength}}{2}$.

Doppler Effect

The apparent change in the frequency or pitch of a wave caused by relative motion between the source and the observer.