Different EM waves are used for different applications, which you are expected to be able to recall and explain. We will go through some of these uses in this article, which is unavoidably long as there is a lot of information to cover. Your exam preparation should therefore involve making summary notes from the wealth … Continue reading EM Waves: Uses and Dangers
Uses and Dangers of EM Waves
Electromagnetic (EM) waves are all similar; they are all transverse waves that travel at the same velocity and are created by the movement of electrons. But they are also different, not only in wavelength and frequency but also in how they are reflected, absorbed or transmitted by different materials. For example, the microwaves that your … Continue reading Uses and Dangers of EM Waves
Electromagnetic (EM) Waves
Electromagnetic (EM) waves are a family of different types of waves that have some specific properties in common; they all propagate (travel) at the same speedthey are all transverse wavesthey can all propagate through free space without the need for any medium The most common examples of EM wave are the various colours of visible … Continue reading Electromagnetic (EM) Waves
How did the Universe begin?
As was the case when we considered models of how the Universe is structured, when it comes to explaining the beginning of the Universe you again need to know about two competing ideas. You also need to know about the evidence that either supports or questions each theory. One theory is the Steady State Theory. … Continue reading How did the Universe begin?
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