hi i'm teacher liz this is quarter to module 1 of grade 10 science module 1 is about electromagnetic waves the most essential learning competency for this module is to compare the relative wavelengths of different forms of electromagnetic waves the nature of electromagnetic waves the proponents of electromagnetic theory but the wavelengths and frequencies of electromagnetic waves for lesson one we are going to talk about the nature of electromagnetic waves we have three objectives for this lesson first is to define what an electromagnetic wave is second is to describe how em waves are produced and propagated and third is to explain some properties of electromagnetic waves [Music] ok let's go a wave is a disturbance that transfers energy statement all right second electromagnetic waves transfer energy through a vacuum again pause for 10 seconds third a moving electric charge is surrounded by an electric field and a magnetic field pause for 10 seconds fourth most e and waves have the same speed plus for 10 seconds and fifth e m waves travel at the speed of three times ten raised to eight meters per second pulse okay salam it's a good [Music] text messages adding cell phones [Music] magnetic waves [Music] what are some properties of e and waves as we go along the video first question what are e-m waves what are waves waves are disturbances that transfer energy from one place to another without transferring matter a common example of a wave is when we move this rope up and down energy travels from our hand to the rope creating a wave pulse sakes other examples of waves are ocean waves sound waves and stadium waves these waves transfer energy by making the particles of matter move the energy is passed along from particle to particle as they collide with their neighbors waves transferring energy identical waves mechanical waves are waves that require a medium to transfer energy material [Music] examples radio waves visible light and x-rays electromagnetic waves electromagnetic waves are waves that do not require a medium to transfer energy they transfer energy even in vacuum or empty space now that we know what the m weeds are let's talk about how are em waves produce and that is for question number two on am waves and magnetic fields now pro produced and em waves kapag charge particle guyan electron aigo magalaong back and forth o pabalik let's consider this electron among a charged particle guy in an electron in a papali bhutan an electric field alibaba is a wire okawa oscillating or vibrating dial oscillating and charge nettle it produces a magnetic field around the charge ibiza bean on charged particle nagumagalao electric field and magnetic field nasham network propagates space the electric and magnetic field in an electromagnetic wave vibrate perpendicular or 90 degrees to each other em waves are also called electromagnetic radiation because they reject from the electrically charged particles electromagnetic waves our final question would be what are some properties of e m waves una they do not require any material or medium for propagation which was clearly discussed a while ago second is that they are produced by accelerated or oscillating charges and third is that em waves travel in vacuum at the speed of three times ten raised if eight meters per second light is a form of electromagnetic wave question can we make the speed of light faster the answer is no the speed of light is the ultimate speed limit nothing can travel faster than the speed of light in vacuum pedal can we make this slower the answer is yes when it travels through a material medium like glass or water and that is the third property of electromagnetic waves they travel in free space at the speed of three times ten raised to eight meters per second here is a question for your reflection notebook how are em waves important in everyday life for your reflection look and so we are now down to our posters on posters i made on five items in each item you will have to complete the statement with the correct concept so let's start first a wave is a disturbance that transfer energy without moving blank pause for 10 seconds next a blank is an empty space or free space pause the video for 10 seconds third electromagnetic waves are created by blank charge particles pause fourth the electric field and magnetic field vibrate blank 90 degrees to each other pause and last item em waves travel at the speed of blank meters per second take a pause finally let's revisit the pretest we had a while ago agree or disagree so following [Music] statements [Music] at gender data and lesson one the nature of electromagnetic waves up next is lesson 2 proponents of electromagnetic theory just click the link above to watch the next video lesson bye