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Can anyone explain by the extent of the change in the electrical field at a given point decreases when the frequency decreases? Is the "extent of the change" referring to the slope of the display of the wave?
Yes I believe the extent of change refers to the concept of the electrical field corresponding to amplitude.
I agree too. The slope of the EM radiation wave display can be seen by looking at the height/amplitude of the wave. The higher the wave, the stronger the force the field exerts on a charged particle. Low frequency represents low energy with larger wavelengths.
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