![]() At the right frequency, which was 43 Hz for that hallway if I remember right, there were nodes and anti-nodes dues to standing waves. For example, in college we put a speaker at one end of a long hallway and drove it with a frequency generator. You can create situations without a fancy lab where you can observe interference effects yourself. Ordinary sounds contains a wide range of frequencies such that even if one specific tone is partly nulled out, we usually don't notice. Note that the nodes and anti-nodes caused by the multipath interference move around as a function of frequency. ![]() You don't notice it much in ordinary life becase there is rarely a situation where sound isn't being scattered from lots of different surfaces and that the frequency is pure enough so that there exists a single null point for all the sound. The phenomena is called multipath interference. The following two videos cover the features of sound as they propagate into a different medium, alongside other sound waves or around corners.These things do happen. Wave superposition occurs when two or more sound waves are travelling through the same medium at the same time, the net displacement at any point in time, is simply the sum of the individual wave displacements. R esonance is the tendency of a system to vibrate with increasing amplitudes at unique frequencies of excitation. Diffraction is the bending of sounds waves around obstacles and openings. Reflection of sound waves occurs when it strikes the surface of another medium and bounces back in some other direction, causing echoes more than 0.1 seconds after the original sound wave was heard. In this post, we conduct investigations to analyse the reflection, diffraction, resonance and superposition of sound waves, as a part of the Prelim Physics course under the module Waves and Thermodynamics and sub-part Sound Waves. What is reflection, diffraction, resonance and superposition in term of sound waves? Latent Heat Involved in a Change of State.Relationship between the Change in Temperature of an Object and its Specific Heat Capacity (Q = mc△T).Relationship Between the Temperature of an Object and Kinetic Energy.Applying Equations and Relationships to Solve Questions (Refraction Index, Snell's Law, Critical Angle, Intensity of Light).Relationship Between the Inverse Square Law, the Intensity of Light and the Transfer of Energy.Practical Investigation: Phenomenon of the Dispersion of Light.Refraction and Total Internal Reflection.Practical Investigation: Formation of Images in Mirrors and Lenses.Behaviour of Standing Waves on Strings and Pipes.Reflection, Diffraction, Resonance and Superposition of Sound Waves.Relationship Between Distance and Intensity of Sound.Displacement of Air Molecules as Variations in Pressure.Practical Investigation: Pitch and Loudness of a Sound.Resonance in Mechanical Systems (Driving Frequency, Natural Frequency, Amplitude, Transfer of Energy).Reflection, Refraction, Diffraction and Wave Superposition.Graphs of Displacement as a Function of Time (Transverse and Longitudinal Waves). ![]()
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