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Two Sources

Part of the Optics, Waves and Modern Physics section of Coddy's Physics journey. Lesson 25 of 53.

Two sources in step, each sending out circular ripples.

Two sources in a ripple tank

Crest meets crest: big waves. Crest meets trough: calm water.

At a point P it depends on the path difference |r₁ − r₂|, in wavelengths.

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Challenge

A point P in a ripple tank is 5 cm from S₁ and 6.5 cm from S₂. The ripples have a wavelength of 1 cm. How many wavelengths N is the path difference?

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All lessons in Optics, Waves and Modern Physics

1Reflection and Refraction

Reflection of LightThe Refractive IndexSnell's LawTotal Internal ReflectionDispersionApparent DepthRecap - Optical Fiber

4Mechanical Waves

What a Wave IsTwo Graphs of a WaveWhen Pulses MeetInterferenceStanding WavesHarmonicsRecap - Guitar String

7Photons

Light Comes in PhotonsThe Photoelectric EffectEinstein's EquationStopping VoltageCounting PhotonsRecap - Solar Cell

10Nuclear Energy

Mass DefectBinding Energy per NucleonFission and FusionRecap - Inside the Sun

2Plane Mirrors

The Image in a MirrorSeeing in a MirrorTwo MirrorsRecap - Periscope

5The Ripple Tank

Two SourcesNodal LinesHow the Pattern ChangesRecap - Two Speakers

8The Bohr Atom

The Bohr ModelEmission and AbsorptionSpectral LinesRecap - Hydrogen Lamp

3Thin Lenses

Lenses and Their RaysThe Lens EquationVirtual ImagesTwo LensesA Lens and a MirrorRecap - Build a Projector

6Light as a Wave

Light Through Two SlitsFringes on a ScreenDiffraction by One SlitThe Diffraction GratingRecap - Measure with a CD

9The Nucleus

Inside the NucleusRadioactive DecayHalf-LifeActivityRadioactive DatingRecap - Carbon Dating