# In radio waves travels from two objects, the wavelength

In life, refraction is shown in many things in life but we don’t seem to notice it considering it as a normal part of life, for example refraction is used in rainbow as Sunlight is refracted inside water droplets in the atmosphere giving dispersion and separation of colors. We can see refraction too when putting a spoon or stick in water refraction is responsible for the “broken” appearance of a spoon half immersed in a glass of water. But first what is refraction? It can be defined as the change in direction of wave propagation due to a change in its transmission medium; and it can occur in many ways like refraction in sound waves, water waves, and others.

But we go deeper in how refraction is reflected in real life, we realize how useful it is; ofcourse that’s alongside with many other factors like doppler effect. When wave energy like sound or radio waves travels from two objects, the wavelength can seem to be changed if one or both of them are moving. This is called the Doppler effect. The Doppler shift causes the received frequency of a supply (how it’s perceived once it gets to its destination) to differ from the sent frequency if there’s motion that’s increasing or decreasing the gap between the supply and also the receiver.

This impact is instantly discernible as variation within the pitch of sound between a moving supply and a stationary observer. Imagine the sound a racer makes because it rushes by, whining high pitched so suddenly lower. The high pitched whine is caused by the sound waves being compacted because the automobile approaches you, the lower pitched sound comes when it passes you and is rushing away. The waves are opened up.

This can be shown in figure 1.0. (Glennan, 2002) The doppler effect is determined whenever the source of waves is moving with relation to AN observer. The impact|Doppler effect|Doppler shift|propagation} can be delineate as the effect created by a moving supply Figure 1.0: Figuire of how is the doppler effect applied  (NASA’s Jet Propulsion Laboratory’s publication, 2000)of waves in which there’s an apparentupward shift in frequency for observers towards whom the supply is approaching and an apparent downward shift in frequency for observers from whom the supply is receding. it’s necessary to notice that the impact doesn’t result due to AN actual change in thefrequency of the supply. using the example on top of, the bug remains manufacturing disturbances at a rate a pair of|of two} disturbances per second; it simply seems to the observer whom the bug is approaching that the disturbances square measure being created at a frequency bigger than 2 disturbances/second.

The impact is merely determined as a result of the space between observer B and therefore the bug is decreasing and therefore the distance between observer A and therefore the bug is increasing.But how did the doppler effect and the idea of refraction in waves simplified many things in life? It did by many ways like: echo testing, speed trap, and the most known one the radar.   A radar is a system for detecting the presence, direction, distance, and speed of aircraft, ships, and other objects, by sending out pulses of radio waves which are reflected off the object back to the source;it is based on the use of radio waves. Radars send out electromagnetic waves similar to wireless computer networks and mobile phones. It works by sendng signals from the radar as short pulses, which increases the possiblty for the signals to be reflected by various objects in their path; which lead them for sending the information and energy sent out back to the radar. It is an analogy, like when shouting in a water well the sound waves will be blocked by the water in the well and then coming back for you to hear them.

In that same method, the pulse reflects off precipitation and sends a signal back to the radar. From this info the radar is ready to inform wherever the precipitation is happening and the way and how precipitation exists. The picture of how the radar is reflected can be shown in figure 2.0 (Aus,2011)