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Dec 5, 2019 · If two sound waves of different frequencies interfere, a varying amplitude results from a switch between constructive interference and destructive interference between the two waves. This variation in the loudness of the sound is known as beats. The beat frequency is defined as the difference in frequency between the two original waves.
sound waves. Sound waves are vibrations that travel through a medium such as air, water, or solid materials, characterized by their frequency, wavelength, and amplitude. These waves are produced by a vibrating source and are longitudinal waves, meaning particles in the medium move parallel to the direction of wave propagation.
- Sound and Light Keypoints
- The Photoacoustic Effect
- The acousto-optic Effect
- Sonoluminescence
- Photon-Phonon Interactions
- Conclusion
Lightandsoundaretwodifferentthings,butthereareafeweffectsthatinvolvetheirinteractionThreeeffectswere discussed:thephotoacousticeffect,theacousto–opticeffect,andsonoluminescenceThe photoacoustic effectinvolvesasoundemissionthatoriginatesfromachangeindensityinducedbylightThe acousto-optic effectinvolvesthe scatteringoflightduetoachangeintheindexofrefractionofamaterialcausedbyasoundwaveThe photoacoustic effect, from the Greek word for light and the Greek for hearing, is a sound emission that originates from a change in density induced by light. A typical example involves a block of stuffthat you blast with a laser. The laser blast causes the stuff to rapidly heat up and expand, and that expansion causes sound waves to propagate t...
The acousto-optic effect, combining the Greek roots for hearing and seeing, is the scattering of light due to a change in the index of refraction of a material that arises as a sound wave passes through and changes the density. Because the change in density from the sound wave is periodic, the light essentially experiences a diffraction grating, wi...
Sonoluminescence, from the Latin for sound and light, is a phenomenon that involves a collapsing bubble emitting a flash of light. I used to be a bubble scientist so this is one of my favorite effects; I have written about it before on PhysicsForums and on my blog. Sound waves, when applied to a bubbly fluid, cause the bubbles to expand and contrac...
Solid-state physics was never my strong suit, but I will briefly mention some sound-light interactions that occur on the quantum level in crystals. Electromagnetic waves can be treated in terms of discrete photons, and likewise, acoustic waves can be treated as phonons, which are discrete vibrations of a crystal lattice. Both of these have their wa...
I don’t expect the information in this article to blow anyone’s mind, but these are interesting and occasionally effects, and those interested in physics, in general, may be keen to learn more about sound-light interaction.
Figure 21.1 – A graph of sound pressure vs. time for a sound wave generated by a tuning fork (top) and the Fourier analysis of that sound wave (bottom). This figure, created by Alyssa J. Pasquale, Ph.D., is licensed under CC BY-NC-SA 4.0. The graphs in Figure 21.2 were generated by a piano playing a single musical note.
Sep 28, 2023 · Musical instruments make sound by harnessing the power of vibrations. When an instrument is played, whether it’s plucked, struck, bowed, or blown, it sets in motion a series of vibrations within the instrument’s components. These vibrations travel through the air as sound waves, reaching our ears and creating the melodies and harmonies we hear.
Sep 12, 2023 · In terms of sound, frequency determines the pitch of the sound you hear. High-frequency sound waves produce high-pitched noises, like a whistle, while low-frequency sound waves produce low-pitched noises, like a drumbeat. Frequency is measured in hertz (Hz), and in everyday life, human hearing ranges from about 20\text { Hz} 20 Hz to 20 {,}000 ...
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2 Sinusoidal pressure waves 2.1 The importance of sine waves. For much of the rest of this unit we shall be concerned with the properties of a type of sound wave that when represented as a graph has a characteristic shape known as a sine wave. Figure 1 shows you what a sine-wave graph looks like. For the moment you need not be concerned with ...
