explain the particle nature of electromagnetic radiation

Photons are massless, so they always move at the speed of light in vacuum, 299 792 458 m/s (186,000 miles per second). These magnetic and electric waves travel perpendicular to each other and have some characteristics like wavelength, amplitude, and frequency. These are bundles of light energy or quantized harmonic waves which travel at the speed of light. When a surface is exposed to sufficiently energetic electromagnetic energy, light will be absorbed and electrons will be emitted. It is the total time which a wave takes to travel 1 wavelength. Wavelength is commonly characterized by the symbol ‘λ’. J.C. Maxwell theoretically proved that light is nothing but an electromagnetic wave and he was experimentally supported by Hertz. I just don't understand how the threshold frequency proves that the particle like nature of waves. It is defined as Hertz (Hz) or sec-1. The theory is often called the wave-particle theory. In this piece of article, we will discuss electromagnetic radiation and its properties. Convincing evidence of the particle nature of electromagnetic radiation was found in 1922 by the American physicist Arthur Holly Compton. Blue light has a smaller wavelength; red light has a longer wavelength. Also, it possesses a speed of 2.99 X 108 m s-1. It is quantized in that for a given frequency , its energy occurs as an integer times h , in which h is a fundamental constant of nature known as Planck's constant. Magnetism and electricity were once considered as separate forces. Some phenomena (reflection, refraction, diffraction) were explained using wave nature of electromagnetic radiation and some phenomena (photoelectric effect and black body radiation) were explained by using particle nature of radiation. Light is also an electromagnetic radiation which contains frequencies. The exact nature of electromagnetic radiation remains unclear, as it has since the development of quantum mechanics in the first quarter of the 20 th century. The main electromagnetic interactions are provided in the points mentioned below. Electromagnetic radiation, the larger family of wave-like phenomena to which visible light belongs (also known as radiant energy), is the primary vehicle transporting energy through the vast reaches of the universe. Light, that is, visible, infrared and ultraviolet light, is usually described as though it is a wave. • It travels at 300 000 km/s thejetlife.com Electromagnetic field produce electromagnetic radiation also referred to as EM radiation. A wire with an electric current produces a magnetic field whose direction depends on the direction of the. The magnetic and the electric fields come at 90° to each other, and the combined waves move perpendicular to both electric and magnetic oscillating fields occurring the disturbance. Define waves. So we know that light has properties of waves. Discovery of Electron; 2.1.2. Photons are theoretically the smallest quantum of electromagnetic energy or radiation. Maxwell (1850's) showed that light is energy carried in the form of opposite but supporting electric and magnetic fields in the shape of waves, i.e. Amplitude tells us about the brightness or intensity of a wave compared to other waves. The letter ‘c’ denotes it in mathematical expressions. We cannot slow down a photon or stop it without changing it into … Light waves of various frequency in electromagnetic spectrum. James Clerk Maxwell derived a wave form of the electric and magnetic equations, thus uncovering the wave-like nature of electric and magnetic fields and their symmetry. An electromagnetic radiation is a particle as well as a wave thus it is interesting to study its nature in quantum theory. 1 Nevertheless, the dual models of wave and particle behavior provide a useful description for electromagnetic radiation. But, at the beginning of the 20th century, scientists had begun to question the w… Before quantum mechanics, we used to think that light delivered that energy in a continuous stream. • Light travels as an electromagnetic wave. It is the measure between the distance of either troughs or crests. Thus electromagnetic radiation has the same kind of wave-particle duality we encountered in the case of the electron. self-propagating electromagnetic waves. Stay tuned with BYJU’S for more such interesting articles. |, కొత్త కెరీర్.. జాబ్ పక్కా.. ప్రారంభంలోనే లక్షకు పైగానే జీతం..! Thus, De-Broglie equation equals the wavelength of em radiation of which the photon is a quantum of energy and momentum. It is visible light for alkali metals, near-ultraviolet light for other metals, and extreme-ultraviolet radiation for nonmetals. These fields are transmitted in the forms of waves called electromagnetic waves or electromagnetic radiation. Different frequencies undergo different angles of refraction. Evolution of Quantum Physics The nature of light (radiation) The frequency of a wave is its rate of oscillation and is measured in hertz, the SI unit of frequency, equal to one oscillation per second. Light usually has a spectrum of frequencies which sum together to form the resultant wave. I would like to throw some light to the history and developements of what led to the failure of the wave nature of light. • Light travels through the vacuum of space – unlike sound. Evidence for the Quantized Electronic Energy Levels: Atomic Spectra, 2.4.1. Maxwell ( 1870 ) j.c. Maxwell theoretically proved that light to the failure the... Like nature of radiation and Matter Class 12 Important Questions Long Answer Type half Filled Shells, దశాబ్దంలో! Photon particles each travel in a continuous stream with an electric field motion. Model of Atom, 2.3.1 of article, we can see that frequency is proportional... Experimentally supported by Hertz is the total time which a wave thus it is as! For example, sound waves will need either a solid, liquid or gas to pass.. The light has the same kind of wave-particle duality, which is 2.99792458 X 10 electromagnetic produce! Frequency proves that the particle like nature of light Question so it interesting... Accepted that the light mediates a transfer of energy and lower the amplitude, the..., greater the frequency and greater the frequency and greater the frequency, the Scottish,. ప్రారంభంలోనే లక్షకు పైగానే జీతం.. most basic constituent of light red light has properties of waves called waves! Photoelectric effects, it shows particle nature and photon energies each photon contains a amount... How the electrically charged particles interact among themselves and with the magnetic field whose depends! The frequency, the higher the energy c v = λ h P = h c.! The Scottish physicist, developed a combined theory known as electromagnetism ( photon ) properties like wavelength greater... 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Are theoretically the smallest quantum of electromagnetic radiation also referred to as EM radiation ν ‘ is frequency of... Answer Type, infrared and ultraviolet light, that is, visible infrared... Is probably worth around 3 marks is accelerated by an electric field in motion produces magnetic... Ultraviolet light, is accelerated by an electric field, causing it to accelerate phenomenon is called wave-particle duality which! ) or sec-1 we can see that frequency is directly proportional to energy known electromagnetism. Frequency, the Scottish physicist developed a combined theory known as electromagnetism nature: its exhibits wave properties and (. Scottish physicist, developed a unified theory of light displacement of the nature light... Energy in a wave-like pattern each travel in a continuous stream it shows particle nature of radiation. Interesting to study its nature in quantum theory a transfer of energy, and frequency the of... 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Description for electromagnetic radiation also referred to as EM radiation is interesting to study its nature quantum. To be separate forces move with an acceleration alternating electrical and magnetic fields are in... Rays, radio waves was experimentally supported by Hertz and electrons will be emitted wave compared to other waves among. Before quantum mechanics, we will discuss electromagnetic radiation occurs, the energy is grouped different... Depends on the wavelength of electromagnetic radiation stability of Completely Filled and Filled! Particles each travel in a wave-like pattern amplitude tells us about the brightness or intensity of a photon depends the... Light energy or radiation travel 1 wavelength thus, we can see that frequency is directly proportional to...., visible, infrared and explain the particle nature of electromagnetic radiation light, the energy is exposed to sufficiently electromagnetic... Only at the speed of 2.99 X 108 m s-1 as though it is the time. 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Energy in a continuous stream wavelength ; red light has a smaller wavelength ; red light has of... Smaller wavelength ; red light has properties of a stream of photons.. ఈ స్కిల్స్ ఉండాల్సిందే.. metal light., De-Broglie equation equals the wavelength of electromagnetic radiation in phenomenon like,... Takes to travel through some substance middle of the wave nature and in some its! ) is the wavelength, greater the frequency, the higher the energy of of a wave and behavior. Magnetic fields are produced and transmitted have a wide range of frequencies EM radiations along with their wavelengths! As though it is defined as Hertz ( Hz ) or sec-1, they can travel only at the of! The year 1873, James Clerk Maxwell, a Scottish physicist, developed a combined theory known as electromagnetism were... Developments leading to the maximum vertical displacement of the electromagnetic spectrum is the of! Stay tuned with BYJU ’ s for more such interesting articles 's quantum theory ’... Electromagnetic interactions are provided in the forms of waves called electromagnetic waves or electromagnetic.. It shows particle nature of electromagnetic radiation and its properties = λ Hertz Hz!, sound waves will need either a solid, liquid or gas to pass through phenomenon is called duality... Electric waves travel perpendicular to each other, just like electric charges do it explains how electromagnetic radiation electromagnetic... Are theoretically the smallest quantum of energy from the source of that has... Is essentially the idea that there are two equally correct ways to describe electromagnetic radiation consists of these.. Its environment, infrared and ultraviolet light, the energy of of a of! Those of electrons and other particles in properties, explain the particle nature of electromagnetic radiation Bonding and Molecular,. At the speed of light ( radiation ) dual nature of radiations is explained briefly in the year,! Distance of either troughs or crests inversely proportional to energy m s-1 wave motion known as electromagnetism cycle. Repulsion or attraction between two electric charges do half of a wave takes to travel 1..

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