1. Unit F: Waves Please make a new tab in OneNote if you haven’t already!

2. Unit D Test and Project If you have not taken the Unit D test or are missing parts of your project (write up, PowerPoint, etc.) you have until tomorrow, otherwise it will be a zero in NetClassroom! If you did not present your project, you need to make an SDL appointment for today or tomorrow.

3. Unit F Pre-Assessment Fill out to the best of your abilities! Turn in to gray bin when complete.

4. Activity 89: It’s a Noisy World Please open your books to page F3.

5. Activity 89: It’s a Noisy World Wave: a disturbance that repeats regularly in space and time that transmits energy from one place to another with no transfer of matter. Much like radiation, waves do not need particles to move sound or noise. Some sound waves are more intense than others.

6. Activity 89: It’s a Noisy World Sound intensity: a measurement of how much sound energy passes through a certain area in a certain amount of time as it spreads out from the source. Scientists measure sound intensity in watts per square meter (W/m 2 ) Watts is the measure of power in the wave, or how strong it is.

7. Activity 89: It’s a Noisy World Decibel (dB): a unit of measure that indicates the relative intensity of a sound.

8. Did you hear that? Do you think everyone in class can hear a quiet sound equally well?

9. Activity 89: It’s a Noisy World Focus: what is the range of sound intensity that humans can hear? Chart in OneNote Content Library. Each card represents a sound. The relative intensity can be compared by measuring the shaded part of the card.

10. Act. 89 Analysis Questions Jigsaw: each person will be assigned a question. Complete the analysis question on your own. Share your answers with the group so that everyone has all of the answers.

11. Activity 89 In Case You Missed It… A wave is a repeating disturbance in space and time that can transmit energy without transferring matter. Sound intensity is the quantifiable measurement of how much sound passes through an area in a specific amount of time as it moves from the source. The decibel (dB) is a unit of measure that can indicate the intensity of a sound,

12. Activity 89 In Case You Missed It… When decibels increase, so does the relative intensity of sound. An increase of 10 decibels means you multiply the relative intensity by 10. Ex: if a sound has a decibel level of 40 and a relative intensity of 10,000, when it increases to 50 decibels, its intensity is 100,000. Decibel (increases by adding 10) Relative Intensity (increases by 10x) 4010,000 50100,000

13. Activity 90: The Frequency of Sound Make a new page lease open your books to page F8.

14. Activity 90: The Frequency of Sound Fill- in Notes The frequency of a sound is the number of vibrations in a second that the ear receives. It is also called the sound’s pitch. Frequencies are measured in hertz (Hz), which is waves cycles per second.

15. Activity 90: The Frequency of Sound Focus : how are frequency and wavelength related? As you complete the procedure, the recorder should take note of the definitions given!

16. Parts of a Wave Amplitude: a wave’s displacement from its state of rest. Wavelength: length of one wave cycle. Lowest part to next lowest part, or highest part to next highest part.

17. Parts of a Wave Crest- highest point in the wave. Trough- lowest point in the wave.

18. Parts of a Wave Crest- highest point in the wave. Trough- lowest point in the wave.

19. Parts of a Wave

20. Activity 90: The Frequency of Sound Frequency and wavelength are inversely proportional, so as one increases the other decreases.

21. Tonight’s Homework Copy the Act. 90 notes from the Content Library to your notebook. Relax