What type of waves are standing waves?
Standing wave, also called stationary wave, combination of two waves moving in opposite directions, each having the same amplitude and frequency. The phenomenon is the result of interference—that is, when waves are superimposed, their energies are either added together or cancelled out.
Interference effects produce both nodes, where the two waves cancel by destructive interference, and antinodes, where the waves reinforce by constructive interference. In transverse waves, the actual motion is perpendicular to the direction of wave propagation.
- In a sense, these points are the opposite of nodes, and so they are called antinodes. A standing wave pattern always consists of an alternating pattern of nodes and antinodes. Physics a point at which the amplitude of one of the two kinds of displacement in a standing wave has maximum value.
- A sine wave or sinusoid is a mathematical curve that describes a smooth periodic oscillation. It is named after the function sine, of which it is the graph. It occurs often in pure and applied mathematics, as well as physics, engineering, signal processing and many other fields.
- For standing sound waves, the wave medium is typically air, and the waves themselves are longitudinal, corresponding to regions of compression and rarefaction of the air. A second important difference is how the traveling sound waves are reflected at the two ends of the pipe.
Formation of Standing Waves. A standing wave pattern is a vibrational pattern created within a medium when the vibrational frequency of the source causes reflected waves from one end of the medium to interfere with incident waves from the source. These frequencies are known as harmonic frequencies, or merely harmonics.
- A node is a point along a standing wave where the wave has minimum amplitude. For instance, in a vibrating guitar string, the ends of the string are nodes. The opposite of a node is an anti-node, a point where the amplitude of the standing wave is a maximum. These occur midway between the nodes.
- In audio signal processing and acoustics, Echo is a reflection of sound that arrives at the listener with a delay after the direct sound. Typical examples are the echo produced by the bottom of a well, by a building, or by the walls of an enclosed room and an empty room.
- Progressive Waves. Waves move energy from one place to another. In a progressive wave the wave front moves through the medium. Transverse waves are waves where the displacement of the particles in the medium is perpendicular to the direction the wave is travelling in.
Updated: 3rd December 2019