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I have this question as well. The question asks: Which of the following happens when the frequency of electromagnetic radiation decreases? Explain your reasoning. Part c says: The extent of the change in the electrical field at a given point decreases.
When a electromagnetic wave is propagating, the wave has an electric and a magnetic field component that is perpendicular to the direction the wave travels. The amplitude of the wave will be related to the magnitudes of this field. I hope this information helps you answer the question.
With regards to this question, how exactly would the decrease in the frequency of electromagnetic radiation contribute to a decrease in the extent of the change in the electrical field? I can understand how these two aspects are related but why does the decrease in frequency affect the electrical field this way?
A change in the magnetic field implies a change electromagnetic radiation. When the frequency decreases, there are less waves in an amount of time, or the waves become less "frequent". They are moving slower, and therefore less waves of radiation will interact with the magnetic field and cause less of a change in the field.
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