This week we are going to talk more about frequency, pitch, waves, and amplitude. We will be using my Oscillo app on my phone to see the waves of our own voices and look at how the wavelengths change with each different sound. Here are some pictures I've taken while using the app. The height of the waves is called the amplitude and determines how loud or soft a sound is. As you can see in the pictures above, both waves are about the same height, meaning they are about the same amplitude, or loudness. We can tell this by how far above they go above the center line. Though the amplitude (volume) is about the same, the frequency and pitch are much different. The first one has a very low frequency- there are fewer, longer wavelengths and they are much easier to see. This means that this sound was a low pitch. The second picture has a high frequency-a LOT of waves, very close together that creates a high pitch sound. The waves are shorter and it is harder to see each wave. Once again, the waves directly above have a similar amplitude and much different frequency and pitch. Can you tell which one is the lower pitched sound? The first one! Let's compare the two high pitched sounds next to each other: These two waves have a very similar frequency and pitch- a very high sound, but a much different volume, or amplitude. The first one is from when I shouted at a high pitch and the second is from when I whispered at a high pitch. You can see the waves are much taller in the one that I yelled than in the one in which I whispered.
I hope that helps to explain amplitude and pitch a bit better!
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