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Light: Electromagnetic waves, the electromagnetic spectrum and photons

Researchers at the University of Illinois at Urbana-Champaign have replicated one of the most well-known electromagnetic effects in physics, the Hall Effect, using radio waves photons instead of electric current electrons. To date, research in quantum optics has primarily investigated the relation between light and matter using small atoms interacting with electromagnetic fields that have substantially larger wavelengths. In an unconventional Researchers at Purdue University have created a quantum spin wave for light.

This can be a carrier of information for future nanotechnologies but with a unique twist: they only flow in one direction. The Magnetospheric Multiscale mission—MMS—has spent the past four years using high-resolution instruments to see what no other spacecraft can.

The Electromagnetic Spectrum

Recently, MMS made the first high-resolution measurements of an interplanetary The ability to control infrared and terahertz waves using magnetic or electric fields is one of the great challenges in physics that could revolutionise opto-electronics, telecommunications and medical diagnostics. A theory Antennas made of carbon nanotube films are just as efficient as copper for wireless applications, according to researchers at Rice University's Brown School of Engineering. They're also tougher, more flexible and can essentially Whether Harry Potter's invisibility cloak, which perfectly steers light waves around objects to make them invisible, will ever become reality remains to be seen, but perfecting a more crucial cloak is impossible, a new study One hundred years ago today, on May 29, , measurements of a solar eclipse offered verification for Einstein's theory of general relativity.

Principles of Remote Sensing - Centre for Remote Imaging, Sensing and Processing, CRISP

Even before that, Einstein had developed the theory of special relativity, which Electromagnetic radiation sometimes abbreviated EMR is a ubiquitous phenomenon that takes the form of self-propagating waves in a vacuum or in matter. It consists of electric and magnetic field components which oscillate in phase perpendicular to each other and perpendicular to the direction of energy propagation. Electromagnetic radiation is classified into several types according to the frequency of its wave; these types include in order of increasing frequency and decreasing wavelength : radio waves, microwaves, terahertz radiation, infrared radiation, visible light, ultraviolet radiation, X-rays and gamma rays.

A small and somewhat variable window of frequencies is sensed by the eyes of various organisms; this is what we call the visible spectrum, or light. This site uses cookies to assist with navigation, analyse your use of our services, and provide content from third parties.

Introduction

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Researchers produce synthetic Hall Effect to achieve one-way radio transmission Researchers at the University of Illinois at Urbana-Champaign have replicated one of the most well-known electromagnetic effects in physics, the Hall Effect, using radio waves photons instead of electric current electrons. Electromagnetic waves form a continuous spectrum of waves. This includes:.


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Electromagnetic waves can be separated into seven distinct groups in the spectrum. Each group contains a range of frequencies. For example, visible light contains all the frequencies that can be detected by the human eye:.

Tour of the Electromagnetic Spectrum

There is an easy way to remember the order of the colours by using a sentence:. Electromagnetic waves Electromagnetic waves are transverse waves. Electromagnetic spectrum Electromagnetic waves form a continuous spectrum of waves.