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1. Properties of electromagnetic waves 9 1 full#
2. Properties of electromagnetic waves 9 1 plus#
3. Properties of electromagnetic waves 9 1 download#

A wave that actually displaces a medium has an obvious direction: that of the displacement. While the disturbance is not always a displacement of a medium, it always has a directional element to it. We therefore can relate the wave speed, wavelength, and period (or frequency):

Properties of electromagnetic waves 9 1 full#

If we pick a specific point on a waveform (called a point of fixed phase for the wave), and follow its motion, it should be clear that it travels a full wavelength in the time of one period. We can make another association of periodic wave properties. Since 1 period is the time required for one cycle, there is a simple relationship between these quantities: Frequency is measured in units of cycles per second, a unit known as hertz( Hz). An alternative way of measuring the temporal feature of the wave is the rate at which medium displacements repeat, called frequency. The wave moves at a constant speed, and the length of each repeating waveform is the same, so the time span required for a single waveform to go by is a constant for the entire wave, called the period of the wave. The snapshot of the wave tells us something about its spatial features, but the wave is moving, so if we want to know something about its time-dependence, we need to select a specific point in space, and observe the displacement of the medium as the wave goes by. A glance at the two diagrams above should make it clear that the wavelength is a universal feature of that particular wave, and does not depend upon where we choose the starting point to be. The quantity \(\lambda\) is the length of the repeating waveform, and is called the wavelength of the wave.

The function repeats itself upon translation by a certain distance in the \(\pm x\) direction. The second way to determine if a wave is periodic is mathematical.

That is, if we look at the same snapshot of the wave as above, we could just as easily demonstrate its periodic nature with different segments:įigure 1.2.1b – Snapshot of a Periodic Wave It should be noted that the starting point of each waveform in the diagram above was chosen arbitrarily. The first is to take a snapshot of the wave, and see if its waveform is repeated in space:įigure 1.2.1a – Snapshot of a Periodic Wave There are a couple ways to determine if a wave is periodic. The most common special characteristic of a wave is when it continually repeats a specific waveform as it propagates.

Properties of electromagnetic waves 9 1 plus#

The bundle includes ten full lessons plus two core practicals for this unit, associated resources and my lesson overview and resources list for the topic.Ī very small number of the resources require access to Pearson Active Teach, however, the vast majority are included in the presentations or as a separate file.There are qualities that are not required of general waves which are nonetheless common features of waves encountered in nature. Lessons include easy to follow presentations that promote high levels of pupil engagement. If you are only teaching combined then see the CP5 bundle with the lessons required for combined only.

Properties of electromagnetic waves 9 1 download#

For Combined lesson guide download the FREE lesson outline for CP5 from my shop. The order and coding for combined and triple science are different for Topic 5 as some of these lessons are not needed for the combined science specification, however, if you are teaching both Triple and Combined this bundle will cover both. Light and The EM Spectrum SP5 Edexcel 9-1 GCSE Physics Triple Scienceįull lessons with resources for those teaching GCSE Edexcel Physics Topic 5 (for Triple Science and Combined).