Electromagnetic Radiation - Revision history

Cliu740: chris liu

2026-04-27T03:59:35Z

chris liu

← Older revision		Revision as of 23:59, 26 April 2026
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	'''Claimed by ~~Yizhou Zhou~~''' (~~Fall 2025~~)		'''Claimed by Chris Liu''' (Spring 2026)

	~~'''Claimed by Bhavin Shah''' (Fall 2025)~~
	==Electromagnetic Radiation==		==Electromagnetic Radiation==

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	===General Properties===		===General Properties===
	~~Basic Description:~~ Electromagnetic radiation can travel through empty space because it consists of oscillating electric and magnetic fields that sustain each other in the absence of a medium (meaning each field supports the ~~existance~~ of the other). Unlike mechanical waves, which rely on particles in a medium to propagate energy, electromagnetic waves can sustain ~~iteself~~ through ~~Maxwell~~ equations. This allows them to travel long distances in vacuum of space.		Electromagnetic radiation can travel through empty space because it consists of oscillating electric and magnetic fields that sustain each other in the absence of a medium (meaning each field supports the existence of the other). Unlike mechanical waves, which rely on particles in a medium to propagate energy, electromagnetic waves can sustain itself through Maxwell’s equations. This allows them to travel long distances in the vacuum of space. This self-propagation occurs because a changing electric field induces a magnetic field, and a changing magnetic field simultaneously induces an electric field, creating a continuous loop of mutual induction. These fields oscillate perpendicularly to each other and to the direction of the wave's travel, identifying them as transverse waves. The speed at which this energy moves is a fundamental constant of the universe, determined by the vacuum permittivity and permeability of space itself. Furthermore, while these fields behave as waves over long distances, they also consist of discrete packets of energy known as photons, which allow the radiation to carry momentum despite having no rest mass. Consequently, electromagnetic waves do not lose energy through friction with a medium, enabling light from distant galaxies to travel billions of light-years to reach us relatively undisturbed.

	Interactive Simulation: Click here https://trinket.io/glowscript/197d345dc751		Interactive Simulation: Click here https://trinket.io/glowscript/197d345dc751
	This simulation shows how the electric (red) and magnetic (blue) field vectors oscillate perpendicular to each other and to the direction of propagation, forming an electromagnetic wave. This demonstrates how EM waves can self-sustain and travel through a vacuum using Maxwell’s equations.		This simulation shows how the electric (red) and magnetic (blue) field vectors oscillate perpendicular to each other and to the direction of propagation, forming an electromagnetic wave. This demonstrates how EM waves can self-sustain and travel through a vacuum using Maxwell’s equations.
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	For fields made by magnetic monopoles, the first point would have E and B switched.		For fields made by magnetic monopoles, the first point would have E and B switched.

	Theoretical Extra Info about Monopoles ~~(field and charges made by monopoles)~~: Magnetic monopoles are hypothetical particles ~~made~~ by grand unification theories and quantum mechanics models. Unlike electric charges, ~~monopoles have not been~~ observed. If they exist, their fields would mirror images of electric fields. Studying their interactions could provide insights into unification of fundamental forces. ~~Particle~~ accelerators and cosmic ray detection continue to search for such.		Theoretical Extra Info about Monopoles: Magnetic monopoles are hypothetical particles predicted by various grand unification theories and advanced quantum mechanics models, like the Dirac string theory. Unlike electric charges, which can be isolated as single positive or negative entities, magnets in our observed world always come as dipoles with both a north and a south pole. If they exist, their fields would essentially be mirror images of electric fields, creating a radial symmetry that currently doesn't exist in standard magnetic theory.
			Integrating these particles into our current understanding would require modifying Maxwell’s equations to include magnetic charge and current densities, which would finally bring a beautiful, dual symmetry to electromagnetism. Studying their interactions could provide profound insights into the unification of fundamental forces, potentially linking the electromagnetic, weak, and strong interactions into a single theoretical framework. Despite their theoretical appeal, they remain elusive; however, high-energy particle accelerators and sophisticated cosmic ray detection arrays continue to search for even a single trace of such a particle to prove they aren't just a mathematical curiosity.
	==The EM Spectrum==		==The EM Spectrum==

Cliu740: Undo revision 48155 by Cliu740 (talk)

2026-04-27T03:55:50Z

Undo revision 48155 by Cliu740 (talk)

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Cliu740: Undo revision 48156 by Cliu740 (talk)

2026-04-27T03:54:59Z

Undo revision 48156 by Cliu740 (talk)

← Older revision		Revision as of 23:54, 26 April 2026
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	'''Claimed by Christopher Liu''' (~~Spring 2026~~)		'''Claimed by Christopher Liu''' (Fall 2025)

	==Electromagnetic Radiation==		==Electromagnetic Radiation==

Cliu740 at 03:48, 27 April 2026

2026-04-27T03:48:01Z

← Older revision		Revision as of 23:48, 26 April 2026
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	'''Claimed by Christopher Liu''' (~~Fall 2025~~)		'''Claimed by Christopher Liu''' (Spring 2026)

	==Electromagnetic Radiation==		==Electromagnetic Radiation==

Cliu740: Edited by Christopher Liu, Spring 2026

2026-04-27T03:47:28Z

Edited by Christopher Liu, Spring 2026

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Yizhou: Standardized and rendered all physics equations using proper $tags for clarity and accessibility$

2025-12-01T04:37:25Z

Standardized and rendered all physics equations using proper <math> tags for clarity and accessibility

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Bhavinshah24 at 15:12, 24 November 2025

2025-11-24T15:12:45Z

← Older revision		Revision as of 11:12, 24 November 2025
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	'''Claimed by ~~Khamsum Wangchuk~~''' (~~Spring~~ 2025)		'''Claimed by Bhavin Shah''' (Fall 2025)
	==Electromagnetic Radiation==		==Electromagnetic Radiation==

Kwangchuk3 at 03:55, 14 April 2025

2025-04-14T03:55:46Z

← Older revision		Revision as of 23:55, 13 April 2025
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	An EM wave has an electric field amplitude of 100 V/m. What is the corresponding magnetic field amplitude?		An EM wave has an electric field amplitude of 100 V/m. What is the corresponding magnetic field amplitude?

	Solution:		Solution:

	~~We use~~ the ~~relationship:~~		Use the equation B = E / c
	\[		→ B = 100 / (3 × 10^8) = 3.33 × 10⁻⁷ T
	B = ~~\frac{~~E}{c} = ~~\frac{~~100}{3 ~~\times~~ 10^8} = 3.33 ~~\times 10^{-7} \ \text{~~T}
	\]		This shows the magnetic field is much smaller, but still essential for wave propagation.

	~~This shows the magnetic field is much weaker than the electric field but still essential for wave propagation.~~

Kwangchuk3 at 03:54, 14 April 2025

2025-04-14T03:54:48Z

← Older revision		Revision as of 23:54, 13 April 2025
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	[[File:Qo.jpg]]		[[File:Qo.jpg]]

	1.)
			An EM wave has an electric field amplitude of 100 V/m. What is the corresponding magnetic field amplitude?

			Solution:

			We use the relationship:
			\[
			B = \frac{E}{c} = \frac{100}{3 \times 10^8} = 3.33 \times 10^{-7} \ \text{T}
			\]

			This shows the magnetic field is much weaker than the electric field but still essential for wave propagation.


	==References==		==References==

Kwangchuk3 at 03:51, 14 April 2025

2025-04-14T03:51:04Z

← Older revision		Revision as of 23:51, 13 April 2025
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	EM spectrum is a span of enormous range of wavelengths and frequencies. The EM spectrum is generally divided into 7 different regions, in order of decreasing wavelength and increasing energy and frequency. It ranges from Gamma rays to Long Radio Waves. Following are the lists of waves:		EM spectrum is a span of enormous range of wavelengths and frequencies. The EM spectrum is generally divided into 7 different regions, in order of decreasing wavelength and increasing energy and frequency. It ranges from Gamma rays to Long Radio Waves. Following are the lists of waves:

	Radio ~~Waves** –~~ Used for communication (radio, TV, cell phones).		*Radio Waves– Used for communication (radio, TV, cell phones).
	Microwaves** – Heat food and power radar systems.		*Microwaves– Heat food and power radar systems.
	~~- Infrared~~ – Used in night vision, thermal imaging, and remote controls.		*Infrared– Used in night vision, thermal imaging, and remote controls.
	- Visible ~~Light –~~ Enables human vision and optical fiber communication.		*Visible Light– Enables human vision and optical fiber communication.
	- Ultraviolet – Sterilizes medical equipment and detects forgeries.		*Ultraviolet– Sterilizes medical equipment and detects forgeries.
	- X-~~rays –~~ Used in medical diagnostics and security scanning.		*X-rays– Used in medical diagnostics and security scanning.
	- Gamma ~~Rays –~~ Employed in cancer treatment and nuclear physics.		*Gamma Rays– Employed in cancer treatment and nuclear physics.

	These applications rely on the wave nature and energy-carrying ability of EM radiation across different frequencies.		These applications rely on the wave nature and energy-carrying ability of EM radiation across different frequencies.

Electromagnetic Radiation - Revision history

Cliu740: chris liu

Cliu740: Undo revision 48155 by Cliu740 (talk)

Cliu740: Undo revision 48156 by Cliu740 (talk)

Cliu740 at 03:48, 27 April 2026

Cliu740: Edited by Christopher Liu, Spring 2026

Yizhou: Standardized and rendered all physics equations using proper tags for clarity and accessibility

Bhavinshah24 at 15:12, 24 November 2025

Kwangchuk3 at 03:55, 14 April 2025

Kwangchuk3 at 03:54, 14 April 2025

Kwangchuk3 at 03:51, 14 April 2025

Yizhou: Standardized and rendered all physics equations using proper $tags for clarity and accessibility$