21. In case of other forms of the dispersion relation, we have dispersive waves. 22. Banded waveguides model dispersive behavior by splitting the propagation of disturbances into frequency bands. 23. This may be a form of dispersive adhesion. 24. Its behaviour said to be dispersive because the rate of attenuation increases with frequency. 25. Additional tuning, and linewidth narrowing, methods include the use of extracavity dispersive optics. 26. When lasers are used, a single detector without any dispersive elements might be sufficient. 27. Furthermore, as dispersive materials, these are limited to functioning at a single wavelength. 28. The Earth-ionosphere waveguide is dispersive . 29. Evidently, the Earth ionosphere waveguide is dispersive because the transfer function depends on frequency. 30. Banded waveguides model dispersive behavior by splitting the propagation of disturbances into digital waveguide method.