# Waves

Télécharger la présentation

## Waves

- - - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - - -
##### Presentation Transcript

1. Waves

2. DO NOW MONDAY • Tell the type of heat transfer happening at each letter. A C B

3. DO NOW TUESDAY • Give your own definition of a wave.

4. Learning Targets • 1.1a Define mechanical wave. • 1.2a Define electromagnetic wave. • 1.3a Identify an electromagnetic wave. • 1.4a Identify a mechanical wave. • 1.5a Differentiate between mechanical and electromagnetic waves.

5. Etch-A-Sketch • Use pages 14-17 in the textbook to complete the handout. • Write the big ideas/important details on the right and then draw a picture to help you understand the word on the left. • If you work alone quietly and very hard for the first 20 minutes, then you may work with the person at the table with you for the last 20 minutes, provided that you get your work completed TODAY. • Any work not completed today is HOMEWORK.

6. DO NOW WEDNESDAY Answer the two questions on the sheet given to you. 1 2

7. Learning Targets • 1.1a Define mechanical wave. • 1.2a Define electromagnetic wave. • 1.3a Identify an electromagnetic wave. • 1.4a Identify a mechanical wave. • 1.5a Differentiate between mechanical and electromagnetic waves.

8. What’s a wave? • Wave: a rhythmic disturbance that transfers energy through matter or space • Two general types of waves: • Mechanical waves • Electromagnetic waves

9. Mechanical Waves • Require matter to travel through • The matter the mechanical wave travels through is called a MEDIUM • Examples of a medium that a mechanical wave can travel through: sound waves, earthquake waves, water waves • Can be transverse or longitudinal Transverse Wave Longitudinal Wave

10. Mechanical Waves • Two types of mechanical waves: • Transverse : matter moves in the medium at right angles to the direction that the wave is travelling • Examples: water waves, S-type earthquake waves • Longitudinal: vibration is parallel to the direction of motion of the wave; back and forth motion; also called compressional waves • Examples: sound waves, P-type earthquake waves

11. Transverse Waves Crest: highest point of a transverse wave Trough: lowest point of a transverse wave Amplitude: the amount of energy carried by a wave; corresponds to the height of a transverse wave Wavelength: the distance between two identical points on a wave

12. Longitudinal/Compressional Waves Rarefaction: expanded portion of the wave; particles are spread apart Compression: compressed (squeezed) portion of the wave; particles are pushed together Wavelength: the distance between two identical points on a wave Amplitude: the amount of energy carried by a wave; corresponds to the amount of compression in a longitudinal wave

13. DO NOW FRIDAY • Answer the two analyzing data multiple choice questions on the sheet that was given to you.

14. DO NOW MONDAY • Identify the parts of the transverse wave labeled with letters below. B C A D

15. Learning Targets • 1.2b Identify the different parts of a wave. • 1.3b Explain the strength of the wave by analyzing amplitude and wavelength. • 1.4b Explain the relationship between the frequency and the type of wave.

16. Amplitude- amount of energy carried by a wave Low Amplitude Medium Amplitude High Amplitude

17. Wavelength- distance between two identical points on a wave Short Wavelength Long Wavelength

18. Frequency- the number of waves that pass a given point in 1 second Low Frequency High Frequency

19. Relationship between amplitude, wavelength, frequency, and energy HIGH AMPLITUDE = HIGH ENERGY LOW AMPLITUDE = LOW ENERGY LONG WAVELENGTH = LOW FREQUENCY = LOW ENERGY SHORT WAVELENGTH = HIGH FREQUENCY = HIGH ENERGY

20. DO NOW TUESDAY Use the following terms to answer the numbers below. Medium Transverse Longitudinal Energy Compression Rarefaction Waves transfer this. Waves in which the matter moves at right angles to the direction of the wave . The matter a moves through. Waves in which the matter moves parallel to the direction of the wave. Expanded portion of a longitudinal wave. Squeezed together portion of a longitudinal wave.

21. Quiz Expectations • QUIET • Do your best. (Eyes on own paper.) • Finished? (Turn your scantronover and write a noteor draw a picture for Mrs. Dyer on the back.)

22. Learning Targets • 1.3b Explain the strength of the wave by analyzing amplitude and wavelength. • 1.4b Explain the relationship between the frequency and the type of wave.

23. Wave Equation • The speed of a wave is equal to its frequency times its wavelength. • The equation is: • Speed = frequency x wavelength • Use the triangle below to solve for the speed, frequency, or wavelength of a wave. v λ f

24. Wave Equation Example: • A tuning fork has a frequency of 310 Hz. The wavelength of the sound produced by the tuning fork is 1.32 m. Calculate the speed of the wave. • SOLUTION: Given: Formula to solve for missing part:  = Setup/Solution: f = v =

25. Wave Equation Guided Practice What is the speed of a wave with a frequency of 760 Hz and a wavelength of .45 m? Given: Formula: Setup/Solution:

26. Wave Equation Guided Practice What is the frequency of a wave that is moving at 30 m/s with a wavelength of .35 m? Given: Formula: Setup/Solution:

27. Wave Equation Guided Practice • What is the wavelength of a wave moving at 340 m/s with a frequency of 256 Hz? Given: Formula: Setup/Solution:

28. DO NOW WEDNESDAY • Answer the two multiple choice questions on the paper given to you.

29. Learning Targets • 1.5a Differentiate between mechanical and electromagnetic waves.

30. Electromagnetic Spectrum • You will work with your group to create a poster/visual of the electromagnetic spectrum. • Be sure to follow the scoring guide given to you. You will only have today to work on this.

31. DO NOW THURSDAY • Calculate the frequency of a wave that is moving at 35 m/s with a wavelength of .45 m. v f λ

32. Learning Targets • 1.2b Identify the different parts of a wave. • 1.3b Explain the strength of the wave by analyzing amplitude and wavelength. • 1.4b Explain the relationship between the frequency and the type of wave. • 1.5b Compare and contrast a transverse and a longitudinal wave.

33. DO NOW FRIDAY • Answer the two multiple choice questions on the paper given to you.

34. Learning Targets • 1.5a Differentiate between mechanical and electromagnetic waves. • 1.3b Explain the strength of the wave by analyzing amplitude and wavelength. • 1.4b Explain the relationship between the frequency and the type of wave.

35. Electromagnetic Waves • Do not require a medium through which to travel (means they can travel through a vacuum such as space) • Examples: radio waves, microwaves, infrared waves (heat), light waves, UV rays, X-rays, gamma rays • Are transverse waves

36. All electromagnetic waves travel at the same speed. • Their speed is the speed of light = 300,000,000 m/s • That’s 186,000 miles/second!!!!!!

37. EXIT SLIP WEDNESDAY Mechanical Waves Electromagnetic Waves Complete the T chart that you were given to differentiate between mechanical and electromagnetic waves.

38. Learning Targets • 1.1a Define mechanical wave. • 1.2a Define electromagnetic wave. • 1.3a Identify an electromagnetic wave. • 1.4a Identify a mechanical wave. • 1.5a Differentiate between mechanical and electromagnetic waves.

39. DO NOW THURSDAY • Each table will be assigned a word from the Etch-A-Sketch Sheet. • You will write the word, the definition/important details about the word on the right side of your page and Sketch a good picture to help you remember it on the left side of the page. You will have 3 minutes to do this. • You will post your page on the wall. • Everyone in the class will do a gallery walk around the room and complete their Etch-A-Sketch WS, then turn in. You will have 7 minutes to do this.