# 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! 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