Request Customized Technical Assistance to address your organization's needs and build your capacity to better serve victims of mass violence and terrorism. Through the Confidentiality Institute, Ms.
Absorption of energy causes heating, which if enough happens at once, can damage tissue. Energy has to specifically and intentionally focused to have an effect. We are exposed to these from space and from the sun, but not from human technology.
Actual exposures are hundreds to thousands of times lower. The photon energy of a cellphone EMF is more than 10 million times weaker than the lowest energy ionizing radiation. A Growing Hysteria" in Skeptical Inquirer 4 In order to understand more deeply the fact that damage from these types of radiation is not merely unlikely but that it is closer to near impossibility, more needs to be explained about the nature of radiation and photons.
The energy of a photon is determined by a formula called Planck's law: Now consider a photon of yellow light. This has a frequency of some 5x Hz. The energy of such a photon is approximately 2 electron volts [ If there is an increase in the power, only the number of photos increase, not its energy.
Thus, a standard yellow sodium lamp with higher power rating provides more light Week 1 an introduction to human more photons, but each photon still has exactly the same amount of energy. A typical cell phone uses a frequency of 1x Hz. The frequency used in a household microwave oven is 2.
Therefore, the energy of photons in these sources will be lower than that of yellow light by a factor of a thousand for the microwave oven and a million for the cell phone. The frequency of a standard 60 Hz power line will be further lower by a factor of one million.
Roughly one million photons in a power line together have the same energy as a single photon in a microwave oven, and a thousand microwave photons have the energy equal to one photon of visible light.
Nor does Ketcham note that the modulated frequencies bringing radio and television transmissions into our homes are stronger and more pervasive than the radio waves used by wireless networks. No one can avoid electromagnetic radiation.
We are constantly exposed to it from light, commercial radio and television transmissions, police 2-way transmissions, walkie-talkies, etc. The frequency of the radiation determines what method of interaction is important.
Gamma Radiation, X-rays and Ultraviolet Light If the frequency of electromagnetic radiation is high enough, photons will have enough energy to ionize atoms, i.
This becomes possible at a frequency just above that of visible light - ultraviolet light, and includes gamma radiation and x-rays. None of them are produced routinely by human technological gadgets.
Gamma rays are found in space, and as the result of radioactive decay and nuclear reactors and atom bombs. X-rays, like radio waves, pass through most material without any interaction at all, and are unlikely to cause any cellular damage. This is why they are safe to use on patients in hospitals.
There is the chance, however, that rare interactions could damage cells or DNA something that radio waves cannot dowhich is why medics and dentists who use X-ray equipment frequently have a screen they stand behind to reduce constant exposure.
What we are exposed to all the time is ultraviolet light. The sun produces this and the Earth's surface is bathed in it. It has a slightly higher frequency and therefore higher energy per photon than light, and is absorbed by most substances, including skin.
It is one of the most common causes of cancer and skin problems. How Radiation Causes Cancer cancer The way that ionizing photons cause cancer is as follows. DNA is the famous double-helix chemical strand that controls how our cells manufacture proteins. It is a delicate process.
DNA is held together by chemical bonds, the same as all other molecules are. High energy photons can knock electrons out of their orbits, or sometimes interact with the nucleus of an atom.
To do this, the frequency of the radiation has to be high enough. It can then damage the DNA. If the frequency isn't high enough mobile phones and radio waves are notthen, the radiation cannot cause ionization no matter how much of the radiation there is. Even when it is absorbed it is rarely cancerous.
Most the time, because of the double-helix structure and various cellular mechanisms of DNA monitoring, the damage is repaired.The Core Rules of Netiquette are excerpted from the book Netiquette by Virginia Shea.
Click on each rule for elaboration. Introduction; Rule 1: Remember the Human; Rule 2: Adhere to the same standards of behavior online that you follow in real life.
Miracles of Human Language: An Introduction to Linguistics from Universiteit Leiden, Meertens instituut (KNAW).
Everywhere, every day, everybody uses language. There is no human society, no matter how small or how isolated, which does not employ. A human right, like any other right, is not a property of persons; rather it is a reason to treat persons in certain ways.
They are not material belongings, rather they are concepts and ideas that are commonly accepted and are generated through universal acceptability.
Complete the Program Orientation and Human Services Foundations Worksheet. Click the Assignment Files tab to submit your assignment.
Program Orientation and Human Services Foundations Worksheet. PART I. Refer to the “ Human Services Program Orientation Presentation” to complete this portion of the worksheet.
There is/was a problem with your internet connection. Please note that some features may not function properly. Please refresh your browser if your internet. Start studying week 1 Introduction to the human body & Cellular level of organization. Learn vocabulary, terms, and more with .