Periodic function



A periodic function is an event that occurs repeatedly in a very regular manner. Suppose that you stand on the beach near a lighthouse. As you watch, the lighthouse's beam will sweep across the landscape in a very regular pattern. You might see the beam pointing directly at you every second, or every two seconds, or at some other regular interval. The

Figure 1. (Reproduced by permission of The Gale Group.)
Figure 1. (Reproduced by permission of
The Gale Group
.)

regularity of a lighthouse beam is one of the ways in which ships at sea recognize the lighthouse and know where they are.

The graphical representation of a periodic function has a very characteristic shape. Figure 1 shows the most common of these shapes. In this graph, the vertical (y) axis shows the amplitude (magnitude) while the horizontal (x) axis shows time. As you go from left to right along the graph, it is as if you were moving forward in time. The origin (the point at which the two axes cross) represents zero time, and each additional second or minute or hour is represented by one unit to the right on the graph.

In the graph of the cosine, the amplitude at time zero is the highest it ever gets. If this graph represented the sweep of a lighthouse light, for example, point zero might be the time at which the light beam was pointing directly at you. As time passes (moving to the right on the x-axis), the amount of light you see (the amplitude) gradually decreases. Eventually it reaches its lowest possible point (the bottom of the curve). At that point, the light would be pointing directly away from you. Then, the light would continue its sweep until it was once more facing toward you.

One of the most important applications of periodic functions is in the study of electromagnetic radiation. Such diverse forms of energy as cosmic rays, X rays, ultraviolet light, infrared radiation, visible light, radar, radio waves, and microwaves all have one property in common: they are all periodic functions. Their properties and behavior can be studied by drawing graphical representations.



Also read article about Periodic Function from Wikipedia

User Contributions:

1
Report this comment as inappropriate
Jan 27, 2017 @ 9:21 pm
WEBPILOT is one of the leading Digital advertising agency in Dubai UAE, specialised in delivering full-service web solutions and digital marketing campaigns throughout UAE. Some of our most popular services include innovative web design, technical web development, search engine optimisation (SEO), content creation, eCommerce builds and social media strategy.
2
Report this comment as inappropriate
Apr 5, 2017 @ 11:11 am
Wow because this is great work! Congrats and keep it up.

Comment about this article, ask questions, or add new information about this topic:

CAPTCHA