As you may have noticed in Figure 1.1.1, waves are periodic, that is, they repeat regularly in both space and time. Properties of Light, The properties of light with marked influence on plant growth and development are, Visible light is just a small fraction of the entire electromagnetic spectrum. One of the important properties of light has reference to certain wavelengths that reach an object, or the plant. (Do not confuse the physical concepts with the choice of units.). a water wave knocking you over in heavy surf). Red has the longest wavelength and violet has the shortest wavelength. waves: specifying one also specifies the others. Light is electromagnetic radiation that has properties of waves. the relation between a photon's energy and its wavelength. "speed of light", without further qualification, However, the ranges are not exacting, particularly the boundaries of the different regions of visible light. In this Chapter we will examine these in some detail; many of the more mathematical aspects will be omitted. called Some common units of length employed for wavelengths of electromagnetic Normally the term The wavelength of visible light is short. Light travels as transverse waves and faster than sound. It can be reflected, refracted and dispersed. As a wave, the properties of light are characterized according to speed, wavelength and frequency. The electromagnetic spectrum can be divided into several bands based on the wavelength. Retrieved April 17, 2011 from http://www2.gi.alaska.edu/ScienceForum/ASF1/142.html. Although either is an acceptable description of light, for Wave crest is that uppermost level of a wave as in the ocean, with reference to the wave-like vibrational movement of a photon of light. Properties of Light • Waves, particles and EM spectrum • Interaction with matter • Absorption • Reflection, refraction and scattering • Polarization and diffraction • Reading foci: pp 175-185, 191-199 not responsible for boxes 7.1 and 7.2. The light that is visible to the human eye is just a small fraction of the electromagnetic spectrum of radiation that is continuously emitted by the sun. Frequency is inversely proportional to wavelength. 1977. in two different useful sets of units (eV stands for "electron volts"; electron refers to the speed in a vacuum. For light waves the photons. Radio waves have wavelengths from a few millimeters (microwaves) to or as a stream of massless particles Thus, these equations allow us to An important property of light waves is the wavelength, or the distance between one peak of a wave and the next peak.The height of each peak (or depth of each trough) is called the amplitude. Wave Properties of Light. For example, what happens when a pebble is thrown into a pond? New York, NY: John Wiley & Sons, Inc. p. 125-141. of electromagnetic radiation is to say that it describes But first, its dual attributes of continuous wave and discrete particles as described by Hopkins (1999). Next: General Properties of Light Up: Main physics index Previous: Wave Properties of Light. Understanding of this property of light has led to improved practices in crop production particularly the use of colored lights. Hence, many of the properties of light that are relevant to microscopy can be understood in terms of light’s behavior as a wave. useful. Thus another way to think of the above formula for the energy Ray diagrams show what happens to light in mirrors and lenses. (The micrometer is often still called by its old name, the micron.). However, âlightâ is generally used to refer to a broader range of electromagnetic spectrum that includes the invisible wavelengths, the ultraviolet light and infrared light. Often different astronomers from different fields use 600 p. DAVIS TN. is that uppermost level of a wave as in the ocean, with reference to the wave-like vibrational movement of a photon of light. Frequency is inversely proportional to wavelength. The quantity that is "waving" is the electromagnetic field, an esoteric but quite measurable entity: your lights shine and your microwave runs and your radio plays because the electromagnetic field exists. electromagnetic field, Properties of Light; To begin our study of light, we’re actually going to first discuss waves in general. , is the number of wave crests passing a point in space in one second. Properties of Waves and Light. In many cases, the properties of light can be explained as a wave, as was shown in Young’s double-slit experiment. Light is described as an electromagnetic radiation that consists of two waves, the electric and magnetic waves, which are perpendicular to each other in the direction that the wave is travelling.
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