Previous blogs have introduced the phenomenon of resonance. In fact, most objects can resonate at more than one frequency and in multiple modes of vibration. This blog will concentrate on resonance at multiples of the the fundamental frequency. These are “harmonics” of the fundamental frequency. A good model to demonstrate the principle of resonance at multiples …
A previous blog explored some potentially useful properties of resonance. The fact that resonance has the power to convert sound wave pressure into mechanical motion can be very useful. On the other hand, however, the fact that it takes so little effort delivered at the proper frequency to excite resonance also has its “down” side. …
Resonance, as discussed in a previous blog, can be either or both beneficial and/or detremental. This blog will explore the beneficial qualities of resonance. Consider the model of a child’s swing discussed in the preceding blog. We all know that by “pushing” or “pumping” at the right time can easily make the swing go higher and …
Nearly everyone has heard the term “resonance” or “natural frequency” but everybody has a little different idea of what resonance is all about. In fact, this is understandable because resonance means different things under different situations and there are many different ways to produce resonance. Resonance is the condition that arises when, at a specific frequency …
The way in which sound sources operating at the same frequency combine to produce constructive and destructive intereference was discussed in a preceding blog. In today’s blog, we will explore how sounds of two different frequencies combine to produce beat frequencies. Two sound sources operating in phase at the same frequency produce reinforcement or constructive …
Sound waves produced by multiple sources, or even within a single source in some cases, interact with one another to produce a variety of interesting and useful results. These interactions are commonly referred to as “interference” but one should not automatically conclude that this kind of interference is in any way related to the interference …
The speed at which sound travels through a sound conducting media varies depending on the media. In general, sound travels faster in liquids than it does in gasses. Solids are the best conductors of all beating out both liquids and gasses. The speed at which sound travels through most materials depends on several variables including …
In a preceding blog I explained how sound waves are produced by a vibrating or pulsing source. Today, I want to take a few minutes to talk about the way sound waves travel through a sound conducting medium and reflect from surfaces. Many years ago in high school physics class, I was taught that sound waves …
Another of the basic properties of sound waves is frequency. Frequency is what we commonly call the pitch or tone of a sound. A higher frequency results in a higher tone while lower frequency results in a lower tone. Within the human hearing spectrum, a piccolo produces higher frequency or higher tones while a tuba …
In the preceding post I explained how sound waves are created by a vibrating or pulsing source and how they are conducted by a sound conducting media. Amplitude, Frequency and Wavelength are characteristics of sound waves that will be important to understand as we progress to an understanding of ultrasonics. Today’s topic is amplitude. The above …
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