unit 4 lesson 2 5 29

hi everyone mr. Russ back again am gonna cover our lesson for Friday May 29th today you're gonna be continuing unit 4 lesson 2 and learning about the properties of waves you can see here on my link that you're gonna be reading pages 44 and 45 and completing the activities on page 46 and 47 today we're gonna be looking at sound waves at the end you are going to do the writing prompt which says choose two of the three types of waves to compare and contrast compare and contrast that means how they're the same and how they're different compare and contrast write compare and contrast paragraph using text evidence and domain specific words those domain specific words are the words over here like crest trough amplitude wave length etc so the three types of waves that we are studying in this lesson are water waves waves on string and today we're gonna be looking at sound waves well let's get right into it the properties of sound waves you have learned that water waves and waves on string both have amplitude wavelength and frequency sound waves also have these three properties amplitude of sound waves like the other types of waves the amplitude of sound waves is the size of the waves but crests and troughs in sound waves are different from those in other types of waves recall that crests and troughs in sound waves are the areas where the matter pushes together and spreads out the amplitude of sound waves is how much the matter pushes together at the crest and how much it spreads out at the troughs if the matter pushes together lot the waves have large amplitude if the matter does not push together as much the waves of small amplitude sound waves move through the air they are hard to see since you cannot see air but you can hear sound waves so you measure the properties of sound by how they sound sound waves with large amplitudes are loud sound waves you make when you put when you yell have large amplitude the matter pushes together lot so the sound is loud sound waves with small amplitudes are quiet the sound waves you you make when you whisper have small amplitude the matter does not push together as much so the sound is quiet and right here's picture that shows the crests where the amplitude is tight together in the trough where it's spread apart sound waves also have wavelength like the other examples of waves the wavelength of sound waves is the distance between two crests that are next to each other you listen to find the wavelength of sound of sound wave high-pitched sound has short wavelength low-pitched sound has long wavelength remember high-pitched is where it's kind of you like low-pitched is kind of deep like whoa frequency of sound waves sound waves also have frequency which is how many crests pass certain point in certain amount of time many people measure the frequency of sound waves as how many crests you enter how many cars enter your ear in second in always frequency and wavelength are dependent of each other two things are dependent when they affect each other the way length of wave affects its frequency more waves will pass given point in certain amount of time if wave has short wavelength so wave with shorter wavelength will have greater frequency wave with longer wavelength will have smaller frequency high-pitched sounds have high frequency low pitch sounds have low frequency so want you to take look at the pair are the diagram here at the bottom to match up the luck so you're gonna be looking at the sound that these different things make and decide is it small amplitude is it small wavelength is it high amplitude is it high wave wave length or large and then you're going to look down here and answer the questions about the different types of waves let's talk quickly about your writing prompt so want you to compare the similarities and differences of two types of waves you're gonna choose either waves on string water waves or sound waves you need to choose two of those three and write paragraph about how they're the same and how they're different alright if you've got any questions please reach out to your teacher hope you guys have great day