Electromagnetic wave reflects off a surface at a 90 degree angle. Standing wave?

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When an electromagnetic wave reflects off a surface at a 90-degree angle, it can indeed create a standing wave pattern due to interference between the incident and reflected waves. This phenomenon is similar to what occurs with mechanical waves on a string. Electromagnetic waves can form standing waves under certain conditions, such as within a laser cavity. The principles of interference also apply to electromagnetic waves, leading to applications like antireflection coatings and optical filters. Therefore, standing waves in electromagnetic contexts are possible and can be explained by Fresnel reflection and refraction principles.
MarekS
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What happens when an electromagnetic wave reflects of a surface at an 90 degree angle and continues moving along the same path as it came from?

Will the two waves that are moving in opposite direction interfer with each other to from a standing wave pattern?

This seems to be the case when you tie one end of a string to something and then move the other end to form a wave like pattern. After having reflected the 2 waves create a standing wave.

I doubt this happens with electromagnetic waves, but I have no to way to test it. Can electromagnetic waves form standing waves under any conditions?

Thank you.
 
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Electromagnetic waves do interfere. This is the reason the double slit interference pattern occurs on a screen when the two coherent sources are focused. Also, this interference principle is used to produce antireflection and high reflecting coatings, and narrow bandpass optical filters (the optical fiber system this information was transmitted on and received by you is in part due to optical filters). Yes, an electromagnetic wave can be a standing wave, for example, in a laser cavity.
 
Do you mean to say, a EM (plane wave) at normal incidient angle with a boundary ?

Yes. There would be standing wave as explain by Fresnel reflection and refraction.
 
Thread 'Variable mass system : water sprayed into a moving container'

Thread 'Variable mass system : water sprayed into a moving container'

Starting with the mass considerations #m(t)# is mass of water #M_{c}# mass of container and #M(t)# mass of total system $$M(t) = M_{C} + m(t)$$ $$\Rightarrow \frac{dM(t)}{dt} = \frac{dm(t)}{dt}$$ $$P_i = Mv + u \, dm$$ $$P_f = (M + dm)(v + dv)$$ $$\Delta P = M \, dv + (v - u) \, dm$$ $$F = \frac{dP}{dt} = M \frac{dv}{dt} + (v - u) \frac{dm}{dt}$$ $$F = u \frac{dm}{dt} = \rho A u^2$$ from conservation of momentum , the cannon recoils with the same force which it applies. $$\quad \frac{dm}{dt}...
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