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What is light? Light is a form of energy Light, like sound and heat, is a form of energy. Our understanding of light starts with what light does and what its properties are (Figure 10.1). We know that: • light travels extremely fast and over long distances; • light carries energy and information; • light travels in straight lines;
Introduction to Light Light is a form of radiant energy or energy that travels in waves. Since Greek times, scientists have debated the nature of light. Physicists now recognize that light sometimes behaves like waves and, at other times, like particles. When moving from place to place, light acts like a system of waves. In empty space, light has a
Oct 17, 2014 · The energy of light is related to its frequency and velocity as follows: E = hν = hC/λ. where E = energy. h = Planck's constant, 6.62517 x 10-27 erg.sec ν = frequency. C = velocity of light = 2.99793 x 1010 cm/sec λ = wavelength. The velocity of light, C, in a vacuum is 2.99793 x 1010cm/sec. Light cannot travel faster than this, but if it ...
Light is absorbed (propagation is stopped) Medium is opaque. If light wave frequency ≠ molecules resonant frequency. Light is reradiated and propagated forward through medium. Medium is transparent. In a solid or liquid, propagation is in straight line. In a gas, propagation is less organized and scatter increases.
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1.S: The Nature of Light (Summary) Thumbnail: An EM wave, such as light, is a transverse wave. The electric E→ E and magnetic B→ B fields are perpendicular to the direction of propagation. The direction of polarization of the wave is the direction of the electric field. In this chapter, we study the basic properties of light.
Electromagnetic waves are distinguished from each other by their differences in wavelengths and frequencies (wavelength is inversely related to frequency). c=fλ c = speed of light = 3.0 x 10 8 m/s in a vacuum = 300,000 km/s = 186,000 miles/s. A light year is the distance that light travels in one year in a vacuum.
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Chapter 1Understanding the Nature of LightThe nature of light has fascinated philosophers, as well. as ordinary people, for thousands of years. The light seemed something ordinary and at the s. me time something very mysterious, magical. According to today's criteria, a truly scienti c approach to the nature of light was initiated about 350 ...
