Radio Waves

• Radio Frequencies Signals: are used to transmit all types of information. Are made by magnetic and electric waves. 

• Electric waves are oriented vertically and Magnetic waves horizontally.

• The electromagnetic radiation is not that harmful as the nuclear radiation, and also is not radioactive. 

• Radio waves travel at speed of light that is: 299792458 meters per second. 

• Lower frequencies=Longer wavelength and vice versa.

• Speed of light/Frequency=Wavelength

• AM: KHz-lees capacity to store information.

• FM: MHz-more capacity to store information.

• Omni Antenna: it spreads its signal evenly in every direction. It´s non directional.

•  Directional Antenna: Radio waves are concentrated in one direction. 

• A non directional antenna puts the RF where the viewers are. 

• A single AM tower acts as an Omni Antenna.

• Three or more AM tower make a Directional Antenna.

• Radio waves pass through and the vacuum space. Plus, they do not travel well through dense materials as water, metal and concrete.

• AM broadcasting uses ground waves.

• The curve of the earth reduces the distance at which RF can be received. The hills do not allow the RF to pass.

• Trees Absorbs RF, buildings reflects and refract RF causing it to bounce off in many directions.

• Lower frequencies travel further than Higher frequencies.

• When both power levels are equal is called Circular Polarity

Computer Programming

Basic topics:

What´s a cumputer lenguage?
It´s a lenguage that allows you to create programs by using the key words that each one present.
What´s an algoritm?
It´s a logical sequence of a program
What´s a pseudocode?
It´s the writing of the lenguage on paper or another non programming program.

How to write a pseudocode

• Start the program.
• Declare the main class, that it´s an important code to operate all the command
• Cpp: the program extention.

Vocabulary:

1. Library: contains all the codes for an especific action. ej: <iostream>
2. Loops: It´s a cycle the user determines to use data a number of times. Ex if(int a=0; a<5;a++) 
3. Variables: Are the differnet types of data you use in the program to store information. They can be:

• Int: it´s a varible type that stores integers numbers. ex:1,2, 3,4,-1,-2,-3-4
• Double:it´s a variable type that store decimal numbers. ex: 2,5;2,3;3,46;etc.
• Char: it´s a variable type that stores letters or symbols. ex: a, b,c,d
• Case sensitive: A ≠a
• Boolean: It´s a variable type that determines two options. ex: T or F
• String:it´s a variable type that stores an array of different variables. Ex: (1,a,3, 3.5,$) five variables.