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Related Concept Videos

Radiation Pressure: Problem Solving01:09

Radiation Pressure: Problem Solving

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The radiation pressure applied by an electromagnetic wave on a perfectly absorbing surface equals the energy density of the wave. The wave's momentum also gets transferred to the surface when an electromagnetic wave is entirely absorbed by it. The rate at which momentum is transmitted to an absorbing surface perpendicular to the propagation direction equals the force on the surface.
The average value of the rate of momentum transfer divided by the absorbing area represents the average force...
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Absorption of Radiation01:05

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The rate of heat transfer by emitted radiation is described by the Stefan-Boltzmann law of radiation:
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Radiation: Applications01:17

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The average temperature of Earth is the subject of much current discussion. Earth is in radiative contact with both the Sun and dark space; it receives almost all its energy from the radiation of the Sun and reflects some of it into outer space. Dark space is very cold, about 3 K, so Earth radiates energy into it. For instance, heat transfer occurs from soil and grasses, the rate of which can be so rapid that frost can occur on clear summer evenings, even in warm latitudes.
The average...
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Momentum And Radiation Pressure01:20

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An object absorbing an electromagnetic wave would experience a force in the direction of propagation of the wave. This force occurs because electromagnetic waves contain and transport momentum. The force accounts for the wave's radiation pressure exerted on the object. Maxwell's prediction was confirmed in 1903 by Nichols and Hull by precisely measuring radiation pressures with a torsion balance. The measuring instrument had mirrors suspended from a fiber kept inside a glass container.
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Generating Electromagnetic Radiations01:10

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The German physicist Heinrich Hertz (1857–1894) was the first to generate and detect certain types of electromagnetic waves in the laboratory. Starting in 1887, he performed a series of experiments that confirmed the existence of electromagnetic waves and verified that they travel at the speed of light. Hertz used an alternating-current RLC (resistor-inductor-capacitor) circuit that resonated at a known frequency and connected it to a loop of wire. High voltages induced across the gap in...
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Plane Electromagnetic Waves I01:30

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The existence of combined electric and magnetic fields that propagate through space as electromagnetic (EM) waves is the most significant prediction of Maxwell's equations. As Maxwell's equations hold in free space, the predicted electromagnetic waves do not require a medium for their propagation. An EM wave comprises an electric field, defined as the force per charge on a stationary charge, and a magnetic field, which is the force per charge on a moving charge.
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    Area of Science:

    • Radiation physics
    • Radiation biology

    Context:

    • Clinical applications of ionizing irradiation in medical imaging and radiotherapy rely on fundamental radiation physics principles.
    • Innovations in radiotherapy aim to enhance dose distribution, targeting tumors while sparing healthy tissues.

    Purpose:

    • To explore the synergy between radiation physics and radiation biology for optimizing radiotherapy treatments.
    • To highlight how a deep understanding of radiation physics fuels advancements in medical applications.

    Summary:

    • The evolution of radiotherapy, including techniques like heavy ion therapy, stems from a comprehensive grasp of radiation physics.
    • Integrating knowledge from radiation physics and biology presents opportunities for significant treatment optimization.

    Impact:

    • Improved dose distribution in radiotherapy leads to more effective cancer treatment with reduced side effects.
    • The interdisciplinary approach combining physics and biology offers a unique pathway for advancing therapeutic strategies.