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Lecture 1.pptx

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Summera Jahan

Light exhibits properties of both waves and particles. As a wave, it is characterized by wavelength and frequency and travels in the form of transverse electromagnetic waves. As a particle, it consists of discrete packets of energy called photons, with the energy of each photon depending on the frequency of the light. Light can be visible, ultraviolet, infrared or other wavelengths and is the fundamental part of electromagnetic radiation.

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Lecture 1.pptx
Light has characteristics of both a particle and a wave ? Light has properties of both particles and waves. ? A wave characterized by a wavelength, denoted by the Greek letter lambda, which is the distance between successive wave crests. ? The frequency, represented by the Greek letter nu (v), is the number of wave crests that pass an observer in a given time. ? A simple equation relates the wavelength, the frequency, and the speed of any wave: ?
? Where c is the speed of the wave¡ªin the present case, the speed of light (3.0?? 108 m s¨C1). ? The light wave is a transverse (side-to-side) electromagnetic wave, in which both electric and magnetic fields oscillate perpendicularly to the direction of propagation of the wave and at 90¡ã with respect to each other.
In physics, the term light refers to electromagnetic radiation of any wavelength, whether visible or not. in this sense, gamma rays, x-rays, microwaves and radio waves are also light. Like all types of light, visible light is emitted and absorbed in tiny "packets" called photons and exhibits properties of both waves and particles. This property is referred to as the wave¨Cparticle duality. The study of light, known as optics.
? Light is also a particle, which we call a photon. each photon contains an amount of energy that is called a quantum (plural quanta). ? The energy content of light is not continuous, but rather is delivered in these discrete packets, the quanta. the energy (e) of a photon depends on the frequency of the light according to a relation known as planck¡¯s law: E = hv ? Where h is planck¡¯s constant (6.626 ?? 10¨C34 J S). ? Sunlight is like a rain of photons of different frequencies. our eyes are sensitive to only a small range of frequencies, the visible-light region of the electromagnetic spectrum. ? Light of slightly higher frequencies (or shorter wavelengths) is in the ultraviolet region of the spectrum, and light of slightly lower frequencies (or longer wavelengths) is in the infrared region.
Lecture 1.pptx
? The output of the sun is shown in Figure 7.3, along with the energy density that strikes the surface of Earth. ? The absorption spectrum of chlorophyll a (curve C in Figure 7.3) indicates approximately the portion of the solar output that is utilized by plants. ? An absorption spectrum (plural spectra) displays the amount of light energy taken up or absorbed by a molecule or substance as a function of the wavelength of the light.
Lecture 1.pptx

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Lecture 1.pptx

  • 2. Light has characteristics of both a particle and a wave ? Light has properties of both particles and waves. ? A wave characterized by a wavelength, denoted by the Greek letter lambda, which is the distance between successive wave crests. ? The frequency, represented by the Greek letter nu (v), is the number of wave crests that pass an observer in a given time. ? A simple equation relates the wavelength, the frequency, and the speed of any wave: ?
  • 3. ? Where c is the speed of the wave¡ªin the present case, the speed of light (3.0?? 108 m s¨C1). ? The light wave is a transverse (side-to-side) electromagnetic wave, in which both electric and magnetic fields oscillate perpendicularly to the direction of propagation of the wave and at 90¡ã with respect to each other.
  • 4. In physics, the term light refers to electromagnetic radiation of any wavelength, whether visible or not. in this sense, gamma rays, x-rays, microwaves and radio waves are also light. Like all types of light, visible light is emitted and absorbed in tiny "packets" called photons and exhibits properties of both waves and particles. This property is referred to as the wave¨Cparticle duality. The study of light, known as optics.
  • 5. ? Light is also a particle, which we call a photon. each photon contains an amount of energy that is called a quantum (plural quanta). ? The energy content of light is not continuous, but rather is delivered in these discrete packets, the quanta. the energy (e) of a photon depends on the frequency of the light according to a relation known as planck¡¯s law: E = hv ? Where h is planck¡¯s constant (6.626 ?? 10¨C34 J S). ? Sunlight is like a rain of photons of different frequencies. our eyes are sensitive to only a small range of frequencies, the visible-light region of the electromagnetic spectrum. ? Light of slightly higher frequencies (or shorter wavelengths) is in the ultraviolet region of the spectrum, and light of slightly lower frequencies (or longer wavelengths) is in the infrared region.
  • 7. ? The output of the sun is shown in Figure 7.3, along with the energy density that strikes the surface of Earth. ? The absorption spectrum of chlorophyll a (curve C in Figure 7.3) indicates approximately the portion of the solar output that is utilized by plants. ? An absorption spectrum (plural spectra) displays the amount of light energy taken up or absorbed by a molecule or substance as a function of the wavelength of the light.