Murakami 10D SHOULD WE USE ELECTROMAGNETIC WAVES FOR MEDICAL PURPOSES? In terms of definition‚ Electromagnetic Wave is a “non-particulate radiation (radiation consisting of waves of energy associated with electric and magnetic fields resulting from the acceleration of an electric charge)”. Thus‚ in simpler words‚ electromagnetic is a transmission of energy‚ caused by the oscillation and of electric and magnetic fields. The word electromagnetic wave or electromagnetic radiation may sound complex
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Electromagnetic Waves Although you might not know it you’re constantly surrounded by thousands of electromagnetic waves every day. Sunlight and x-rays are only two types of electromagnetic waves‚ other types are: radio wave‚ infrared rays‚ ultra-violet rays and gamma rays Nature of an electromagnetic wave Electric and magnetic fields are not made up of matter. An electromagnetic wave consists of an electric and magnetic field and doesn’t need a medium to exist. They are the regions through
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Electromagnetic waves in space See the book “Optics” by Hecht sections 3.2 and 3.3 Speed of light: EM waves travel in a vacuum with speed c = c = 299‚792‚458 ms-1 exactly They are transverse waves with (vector) E and B field orthogonal to each other‚ for this section bold indicates vector quanties. When far from the source (many wavelengths) the E and B fields are in phase The vector E x B points in the direction of motion Travelling waves can be written as E = E 0 ⋅ ei ( kx −ωt ) and B = B 0 ⋅ ei
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1.0 What Causes the Tides Tides are periodic rises and falls of large bodies of water. Tides are caused by the gravitational interaction between the earth and the moon. Tides are the cyclic rising and falling of earth’s ocean surface caused by the tidal forces of the moon and the sun acting on the earth . Tides cause changes in the depth of the sea and produce oscillating currents known as tidal streams‚ making prediction of tides important for coastal navigation. The strip of seashore
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seven different waves. The waves are in the order of how big the wavelength is and its frequency‚ from the biggest to the smallest: Radio waves‚ Micro waves‚ Infrared‚ Visible light‚ Ultra Violet‚ X-rays and Gamma rays. Each of them has their own special use in everyday life. For example‚ to turn on a TV you need to use Radio waves‚ to heat your food you use Microwaves and X-rays are used to look into people’s bodies. Some waves‚ like Radio waves can be as big as a building or waves like Gamma rays
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of an electronic wave packet in the unifonn field in the interelectrode space of the vacuum photodetector is investigated. It is shown that the dimensions of such a packet must be of an order or more then one micron. It is shown that such localized charges can give rise to abrupt pulses of the current in the external circuit of the photodetector. The determination ofparameters of such packet by powerful laser pulse scattered with is discussed. The motion of one-electron wave packet in the nonuniform
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WAVES OF MIGRATION 1. The Negritos * first people to come to the Philippines * also called Atis or Aetas * They came across land bridges from mainland Asia about 25‚000 years ago. * Philippines then‚ was connected to Asia by land bridges which later sank below the sea * very small people‚ less than 5 feet tall * Were called "Negritos" because they had black skin‚ short kinky hair‚ thick lips‚ and black noses. * they wore little
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my chair out of his office‚ and headed for the boardwalk. The sun is setting; the ocean waves are crashing against the shore pounded with the rhythm of my beating heart. Spending the rest of my life in a wheelchair meant giving up the things I love‚ no dancing‚ no high heels‚ no hiking‚ no beach-combing. As I watched as the waves rose up‚ curled‚ then crashed; drew back into the sea. With each crash‚ the waves seemed to pull a piece of my life out to sea‚ saying‚ no more. . . no more. ... I couldn’t
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Objectives * Measure the detector frequency for waves emitted from a slowly moving source as that source is approaching the detector. (Exploration 1) * Calculate the detector frequency for waves emitted from a slowly moving source as that source is moving away from the detector. (Exploration 2) * Sketch the wave-front patterns for wave sources with various source speeds. (Exploration 3) Description of Activity In this activity‚ you will study waves that travel from a moving source to a detector
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in a cylinder with pistons on each side it can be compressed as pistons push in‚ raising the pressure inside. There will be a net force from the pressure to push the piston back out. Since gas has mass it can support oscillations and waves. 2.2 Traveling Sound Waves in Air When a cone of a speaker moves out‚ it compresses air next to is and imparts an outward velocity to the air molecules around it‚ in addition to the random thermal velocities of air molecules. The molecules nearest to the speaker
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