Topic: Does wifi, cellphone or microwave radiation affect our health? and Why? 

a) Different parts of the EM spectrum

b) What's in common and what are the differences among different parts of the EM spectrum?

c) What makes them harmful or not harmful to human body?

d) Which part do wifi, cellphone, or microwave radiation belong to? Are they harmful to human body? If yes, what makes them harmful? If no, please explain. What evidence do you have to support your claim/hypothesis?

1.) The Electromagnetic spectrum(EM) includes, from longest wavelength to shortest:

• Radio Waves: Instant Communication
• Microwaves: Data and Heat.
• Infrared Waves: Invisible Heat.
• Visible Light Rays. Sun, Bulbs, Neon Lights
• Ultraviolet Waves: Energetic Light.
• X-rays: Penetrating Radiation.
• Gamma Rays: Nuclear Energy.

2.)They all have things in common. They are all travelling at the same speed (the speed of light = 3 × 10^8 m/s) in vacuum. They are all transverse waves, it is a moving wave whose oscillations are perpendicular to the direction of the wave or path of propagation,

with the oscillations being electric and magnetic fields. Like all waves, they can be reflected, refracted and diffracted.

They only differ from each other in wavelength. It's symbol is lambda (λ), formulated as  λ = v/f where v is velocity and f is frequency.

Wavelength is the distance between one wave crest to the next. Waves in the electromagnetic spectrum vary in size from very long radio waves the size of buildings, to very short gamma-rays smaller than the size of the nucleus of an atom. Frequency is the number of waves that form in a given length of time. It is usually measured as the number of wave cycles per second, or hertz (Hz).

3.) Some of us did not understand what truly the effect of EM waves. In common, we all know that it in every heat produces by these EM waves, where radiation occurs. But the truth is they have different levels of radiation, from longest to shortest wavelength, they have different radiation characteristics. The human body has the ability to absorb these radiations might be harmful and can cause even different disease like cancers, mental disorders, neurologic illnesses, fetal abnormalities, cardiovascular diseases, etc. Over-exposure to certain types of electromagnetic radiation can be harmful. The higher the frequency of the radiation, the more damage it is likely to cause to the body, examples of it are microwaves, infrared, x-rays and gamma rays, these waves produces high frequency where high intensity of heat occurs.

4.) Wifi, cellphone, or microwave radiation belongs to UHF(ultra high frequency), UHF designation is for radio frequency (radio waves) in ranges between 300 megahertz (MHz) and 3 gigahertz (GHz).

These radiofrequency waves can be harmful for human health since it produces high amount of heat which can damage some part of our body, especially skin/skin cells, it also could lead to increased body temperature, especially in the head and neck, who have a low threshold dose and increases the probability of injury if there is long-term exposure to these waves. Some scientific evidence suggests that cancer is not only linked to mobile phone radiation and that other factors also may be involved in its development. Many scientific studies have been done on the radiobiological effects of RF waves, and most of them have reported the rare relationship between RF exposure and risks posed by mobile phones on the body in the past years.

According to WHO(world health organization), the main effect of radiofrequency electromagnetic fields is heating of body tissues.

Exposure to very high levels of RF radiation can be harmful due to the ability of RF energy to heat biological tissue rapidly. Exposing to very high RF intensities can result in heating of biological tissue and an increase in body temperature.