一、First of all,the use of mobile phone is harmful to health.Electromagnetic waves alter [electric activity of the brain] and cause disturbance in sleep 1.It also causes difficulty in concentration,fatigue,and headache [2]; and increase reaction time in a time-dependent manner [3].They incr...
一、First of all,the use of mobile phone is harmful to health.Electromagnetic waves alter [electric activity of the brain] and cause disturbance in sleep 1.It also causes difficulty in concentration,fatigue,and headache [2]; and increase reaction time in a time-dependent manner [3].They incr...
MRI (Magnetic Resonance Imaging) scanning is a technique that uses a very strong magnetic and radio frequency waves to produce an image of the body. MRI scanning machine was invented by a scientist named Raymond Vahan Damadian in 1969.
Radiant energy basically encompasses all energy that is found in electromagnetic waves.Advantages of radiant energyinclude: it is relatively cheap to set up and it is easy to use on a small scale. The main disadvantage of radiant energy is not efficient for large amounts of energy. #10 Compre...
Introduction: Electromagnetic waves are carried from one point to the other by many means such as coaxial cable, two wire line, optical fiber, microstrip lines, waveguide etc. Waveguides are specialized hollow metallic structures used to guide electromagnetic waves from one point to another. They ar...
This orients the light waves in one direction so the electromagnetic waves oscillate in only one plane. Next, this beam is directed through a two-layered modified Wollaston prism which splits the beam into two beams which are spatially separated by a distance equal to the resolution of the ...
This practice was usual for centuries up until the early 20th century where the use of waves, electromagnetic or not, in medicine began. One type of the waves used was the ultrasound wave. The ultrasound waves, are sound waves with a frequency higher than that of the audible human hearing ...
electromagnetic waves like IR, RF, satellite, etc. In the present day, wireless communication technology refers to a variety of wireless communication devices and technologies ranging from smartphones to computers, tabs, laptops,Bluetooth Technology, printers. This article gives an overview of wireless...
First of all‚ Mobile phone has many disadvantages to human health. According to researchers‚ the electromagnetic waves are the cause of insomnia‚ difficulty in concentration‚ fatigue‚ headache‚ rise in blood pressure and cancer. The American Journal of Epidemiology published a study ...
Radio waves 10–1,000 3× 105–3 × 107 Table 1. Frequency and wavelength domain of electromagnetic radiations The decomposition of electromagnetic radiation into its component wavelengths is fundamental to spectroscopy. Evolving from the first crude prism spectrographs that separated white light into...