- #1
Swapnil
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I was wondering, when an EM wave goes from one medium to another why is it that the frequency remains constant?
Exploring the Constant Frequency of EM Waves
In summary, the frequency of an electromagnetic wave remains constant when it goes from one medium to another due to the boundary conditions that the electric and magnetic fields must satisfy. This is because the perpendicular component of the electric displacement vector D must be equal at the boundary at all times to preserve continuity, which can only be achieved if the frequency of the wave on both sides of the boundary is the same. This information was sourced from lectures on electromagnetism at the University of Texas.
- #2
jtbell
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Science Advisor
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It's because of the boundary conditions that the electric and magnetic fields must satisfy.
http://farside.ph.utexas.edu/teaching/em/lectures/node70.html
http://farside.ph.utexas.edu/teaching/em/lectures/node76.html
http://farside.ph.utexas.edu/teaching/em/lectures/node70.html
http://farside.ph.utexas.edu/teaching/em/lectures/node76.html
Last edited:
- #3
Claude Bile
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The perpendicular component of the electric displacement vector D, must be equal at the boundary AT ALL TIMES to preserve continuity - this is only possible if the frequency of the wave on both sides of the boundary is the same.
Claude.
Claude.
- #4
Swapnil
- 459
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Makes sense. Thanks! 
Related to Exploring the Constant Frequency of EM Waves
1. What are EM waves?
EM waves, or electromagnetic waves, are a type of energy that travels through space at the speed of light. They are created by the acceleration of electrically charged particles and can range from low frequency radio waves to high frequency gamma rays.
2. How do EM waves maintain a constant frequency?
EM waves maintain a constant frequency because they are produced by the oscillation of an electric field and a magnetic field perpendicular to each other. This oscillation occurs at a specific rate, which determines the frequency of the EM wave.
3. What factors can affect the frequency of EM waves?
The frequency of EM waves can be affected by the source of the waves, such as the type of material or device producing them. It can also be affected by the medium through which the waves are traveling, as different materials can cause the waves to speed up or slow down. Additionally, the strength and direction of the electric and magnetic fields can also impact the frequency of EM waves.
4. How are EM waves used in everyday life?
EM waves have a wide range of applications in our daily lives. They are used in telecommunications, such as radio and television broadcasting, as well as in wireless communication systems like cell phones and Wi-Fi. EM waves are also used in medical imaging, such as X-rays and MRI scans, and in cooking with microwaves.
5. Why is it important to study the constant frequency of EM waves?
Understanding the constant frequency of EM waves is crucial in various fields, including physics, engineering, and medicine. It allows us to develop technologies that rely on specific frequencies, such as communication systems and medical devices. Studying EM waves also helps us gain a better understanding of the fundamental laws of nature and the behavior of energy in our universe.
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