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In this section, we examine the quantitative expression of energy in waves. This will be of fundamental importance in later discussions of waves, from sound to light to quantum mechanics.
- 17.2: Speed of Sound, Frequency, and Wavelength
Sound and light both travel at definite speeds. The speed of...
- 17.2: Speed of Sound, Frequency, and Wavelength
5 Δεκ 2019 · Sound received by our human ears and light received by our human eyes may often seem to be two parts of the same phenomenon, but they are actually quite distinct. Sound waves are longitudinal waves that can travel through air at about 343 m/s. Light waves are EM radiation and travel at 3 × 10^8 m/s.
In this section, we examine the quantitative expression of energy in waves. This will be of fundamental importance in later discussions of waves, from sound to light to quantum mechanics. Energy in Waves. The amount of energy in a wave is related to its amplitude and its frequency. Large-amplitude earthquakes produce large ground displacements.
Make waves with a dripping faucet, audio speaker, or laser! Adjust frequency and amplitude, and observe the effects. Hear the sound produced by the speaker, and discover what determines the color of light.
Light, sound, and waves in the ocean are common examples of waves. Sound and water waves are mechanical waves; meaning, they require a medium to travel through. The medium may be a solid, a liquid, or a gas, and the speed of the wave depends on the material properties of the medium through which it is traveling.
Features of waves. All waves transfer energy from one place to another. Examples of waves are all around us and include light, sound, ocean waves, radio waves, and radiation.
Sound and light both travel at definite speeds. The speed of sound is slower than the speed of light. The first firework is probably very close by, so the speed difference is not noticeable. The second firework is farther away, so the light arrives at your eyes noticeably sooner than the sound wave arrives at your ears.
