G10 Advanced Physics Term 3: Interference Flashcards

Vocabulary flashcards covering the key concepts of light interference, coherence, and the Young's double-slit experiment based on G10 Advanced Physics notes.

Coherent Sources

Light sources that emit waves with a constant phase difference and the same frequency.

Monochromatic Light

Light that consists of waves of a single frequency, wavelength, or color.

Interference

The process that occurs whenever two or more waves combine to produce a resultant wave with a new amplitude.

Principle of Superposition

The principle stating that if two waves occupy the same region, the total displacement at any point is the vector sum of their individual displacements at that point.

Constructive Interference

Interference that happens when the resultant wave has a larger amplitude than any of the individual waves because the crests and troughs overlap.

Destructive Interference

Interference that happens when the resultant wave has a smaller amplitude than the individual waves because the crest of one wave overlaps with the trough of another.

Bright Fringes

Bands on a screen that represent locations of constructive interference with the highest intensity in the middle.

Dark Fringes

Bands on a screen that represent locations of destructive interference with zero intensity.

Path Difference

The difference in distance traveled by waves from two different slits to reach the same point on a screen.

Laser Light

An example of a light source that is coherent, monochromatic, and directional.

Filament Lamps

Light sources that produce incoherent light waves.

$$x$$

The distance on the screen from the central bright fringe to the first bright band.

$$d$$

The separation distance between the two slits in a double-slit setup.

$$L$$

The distance from the slits to the screen in an interference experiment.

$$m$$

The order of maxima, which can be values such as $0, 1, 2, \text{...}$ used to locate constructive interference.

Double-Slit Equation

The mathematical relation \text{m}\times\text{\lambda} = \frac{x_m \times d}{L} used to calculate wavelength or other experimental parameters.

Slit Width ($a$)

A factor that increases the amount of light and fringe brightness but does not change the fringe spacing.