Keratin Removes Curl From Hair

MIRRORS



A mirror is a surface capable of reflecting light and clear enough to form an image.
The simplest example is the mirror plane. In it, a beam of parallel light rays can be reversed completely as a whole and continue to be a parallel beam and can thus produce a virtual image of an object with the same size and shape as the real. However, the image is inverted.
There are also concave mirrors and convex mirrors. When a mirror is concave and the curve is a parabola, a beam of parallel light rays converge at the focus. Conversely, a light source "point" located at the focus is reflected as a beam History


parallel
mirrors as toilet utensils and manual object were widely used in Greek civilizations, Egyptian , Etruscan and Roman . Were made always with brushed metal, usually silver or bronze , this process is known as the audience. Plate had a round or oval, usually decorated with engravings or mythological reliefs on the back (the Romans lack of prints, but no relief) and carved handle to grasp comfortably while wearing, of which are preserved some museums are still many sites. During the high Middle Ages, hardly made use of the mirror until the thirteenth century invented the manufacturing of glass and rock crystal on foil (or lead amalgam or tin are silvered mirrors), while for this to be constructed of metal only to the eighteenth century .
as a true mirror room furniture can be argued that begins with the sixteenth century because although the two previous centuries lists some historic examples was barely known and their use was rare. In this century, is presented with elegant setting and artistic standing occupies a distinguished place in the classroom as movable object and small size. By the late seventeenth century factories Venetian mirrors fail to build large and since then uniquely serve as decorative objects in the classroom, in which figure prominently.
modern mirrors consist of a thin layer of aluminum deposited on a glass plate, which protects the aluminum and makes the most durable mirror. Folklore



The mirror has an important place in mythology and superstitions of many peoples. The image it reflects is often identified with the soul or spirit of the person: hence eg that vampires, bodies without soul, are not reflected in it. When a dying man is about to leave this world, it is common to cover the mirrors, for fear that the soul of the dying is enclosed in them.
The mirror is conceived and, as a window to the world of spirits. The urban legend of Veronica exemplary uses that vision. Conversely, the spirit world tends to be imagined as a specular counterpart of the living. Lewis Carroll masterfully develops the idea of \u200b\u200bmirror world as input to a reverse in the second part of the adventures of Alice.
The mirror is also a frequent subject of inquiry: he is deemed capable of displaying objects and events distant in time or space. In the story of Snow White, the mirror has the ability to speak and answer questions put to him by the stepmother. JRR Tolkien takes this tradition of magical mirror capable of displaying the future, in his famous mirror of Galadriel. In the novel Harry Potter and the Sorcerer's Stone, JK Rowling, appears the mirror Erised (Desire read in reverse), which reflects the image of the beholder, but their deepest desires

Courtesy: Andrea Carolina Yepes 7 º B

Pokemon Platinum Menu Freezing Fix

What is light?

light (from the Latin lux, lucis) is an electromagnetic wave composed of energized particles called photons capable of being perceived by the human eye as often or energy determines its color . The science that studies the main ways of producing electricity, as well as control and lighting applications is called .

Features

light household lighting is an art and a way to enhance the beauty, create environments and provide comfort to people who enjoy each space, without forgetting the obviously practical guide to the location and different points of view of a house.
Distribution lighting in each space has to be done taking into account the type of stay question and the activity that takes place in it.




Therefore there:


- a general light: the usual and necessary in all instances that usually part of a central lamp.

- a direct light, very typical for specific activities within the room and read or write.

- ambient light, which gives more privacy.
Given these different possibilities to brighten any room in a home now have to find the type of light bulb suitable. This choice must be made by each of the above issues into account both the characteristics of the environment and the actual power consumption.

So you can talk about four main types of bulbs:

- Incandescent: These are the most traditional bulbs used in most homes. These are the cheapest in the timing of the purchase, but its consumption is usually higher than for other types. Anyway, different manufacturers have evolved into forms and colors.

- Halogen: they offer more light and brightness and focus more than before. Consumption levels are very similar that of incandescent halogen lamps but last up to two to three times more. As a decorative element are appealed because it suits the different styles available but are particularly used in walkways.

- Fluorescent: offer good quality of light and are generally economical since they last 10 times longer and consume 80% less energy than incandescent lamps. They are particularly profitable in those spaces where the light will stay on for several hours as general lighting areas rather broad. They are used especially in kitchens, garages or even DIY shops.


-saving lamps Energy: is the newest addition to home lighting is concerned. Generate a warm glow and as the name can be no hope for are the least consumed and longer offered (it can be up to 8 times longer than incandescent). They are particularly suitable for extended lighting requirements and never short space of time as they take a few minutes to reach optimum performance.

With this in mind you can plan your home lighting or light renovarlapara best benefit with the least possible consumption.

RUDDY Clemon CARDOZO Karelia.

:7-B GRADE

Remove All Pubic Hair With Depilatory Cream

LIGHT SOUND WAVES ELECTROMAGNETIC

SOUND

NATURE OF SOUND The sound is a physical phenomenon that stimulates the sense of hearing . In humans, this occurs whenever a vibration frequency between about 15 and 20,000 hertz reach the inner ear. The hertz (Hz) is a unit of frequency corresponding to one cycle per second. These vibrations reach the inner ear transmitted through the air, and sometimes restricts the term "sound" to the transmission medium. However, in modern physics often extends the term to similar vibrations in liquids or solids. Sounds at frequencies above about 20,000 Hz are called ultrasonic.


frequency characteristics of sound: A shrill sound waves there are more than a fraction of time in a low tone. The number of waves that fit in a given time is called frequency and is measured in Hertz (Hz), the unit of frequency.

Amplitude: The amplitude of a sound wave is the degree of movement of molecules air wave, which corresponds to the intensity of thinning and compression that go with it. The greater the amplitude of the wave, the molecules hit harder and louder the drum sound is perceived.

Intensity: The distance you can hear a sound depends on its intensity, which is the average energy flow per unit area perpendicular to the direction of propagation.

Bell: If it touches the middle C is located on a violin, a piano and a tuning fork with the same intensity in all three cases, the sounds are identical in frequency and amplitude, but very different in timbre.

Speed \u200b\u200bof sound: frequency of a sound wave is a measure of the number of vibrations per second from a certain point. The distance between two compressions or two rarefactions successive wave is called wavelength. The product of wavelength and frequency equals the speed of wave propagation, which is the same for sounds of any frequency (when the sound propagates through the same medium at the same temperature). THE ECO



An echo is a reflected sound wave. The interval between the emission and the repetition of sound corresponds to the time it takes for the waves to reach the barrier and return. Often, the echo is weaker than the original sound because not all waves are reflected. Generally, the echoes heard in the mountains occur when sound waves bounce off large areas over 30 m away from the source. Tapping into a metal tube to your ear can also hear echoes.


THE HUMAN EAR

Ear, the organ responsible for hearing and balance. It is divided into three zones: outer, middle and inner. Most of the inner ear is surrounded by the temporal bone. The outer ear is the part of the hearing which is lateral to the eardrum or tympanic membrane. The middle ear is located in the tympanic cavity tympanic cavity called, whose outer face is formada por la membrana timpánica, o tímpano, que lo separa del oído externo. El oído interno, o laberinto, se encuentra en el interior del hueso temporal que contiene los órganos auditivos y del equilibrio, que están inervados por los filamentos del nervio auditivo.


CUERDAS Y TUBOS SONOROS

Cuerdas sonoras. Es un cable elástico, tendido entre 2 puntos fijos, susceptible de emitir un sonido musical gracias a sus vibraciones.

Tubos sonoros. Es un tubo de madera o de metal en general cilíndrico de sección circular o rectangular, en el interior del cual el aire en vibración presenta un sistema de ondas estacionarias correspondientes a una frecuencia audible.



PREPARED BY: MARIA CAMILA ATAYA PARAL
GRADE 7 "B"

Absessed Tooth And Bells Palsy

electromagnetic waves

An electromagnetic wave is the propagation of electromagnetic radiation through space, and theoretical aspects are related to the solution waveform supported Maxwell equations.
Unlike mechanical waves, electromagnetic waves do not require a material medium to propagate. waves are produced by the oscillation or acceleration of an electric charge. Electromagnetic waves are electric and magnetic components. Electromagnetic radiation can be ordered in a spectrum ranging from very high frequency waves (small wavelengths) to very low frequencies (higher wavelengths). Visible light is only a small portion of the electromagnetic spectrum.

History of the discovery

The electromagnetic field in an environment variable is always manifested as a wave attenuated, although it can spread through space in a self-sustaining wave that does not require a means to propagate. This idea spread in the vacuum was strange at the time, and in time assumed the existence of ether holding these waves, a hypothesis that had to be discarded after the Michelson-Morley experiment ). Maybe greatest theoretical achievement of physics in the nineteenth century was the discovery of electromagnetic waves. The first indication was the unexpected relationship between electric phenomena and the speed of light.

approximate speed of 300,000 km / s is called with the letter c. All electromagnetic radiation spectrum presents the typical properties of wave motion, like diffraction and interference. Wavelengths ranging from billionths of a meter to several kilometers. The wavelength (l) and frequency (f) of electromagnetic waves, related by the expression l ° F = c, are important in determining its energy, its visibility, its power of penetration and other characteristics.

electromagnetic sources of litter are:
1. waves caused by the transmissions of radio stations and
2. waves caused by television broadcasts
3. the x-rays microwaves. The

electromagnetic waves follow a straight path and speed is constant in each specific environment. In passing from one medium to another the only character ISTIC that remains constant is the frequency. The speed varies for each wavelength. The frequency and wavelength are related according to the following mathematical expression : Wavelength = CXT = C ÷ f

Prepared by:

JUAN PABLO CARDENAS MANCHEGO

7 º B