Waves and Energy

1. Waves and Energy sound, light*,water seismic (earthquakes)

2. Draw a mind map for waves and energy

3. Describe the characteristics of the wave. Mexican Wave clip

4. Properties of Waves A wave is a transfer of energy from one point to another with out the transfer of material between the two points. and sound waves from a speaker

5. Main properties of waves Other terms Period (T) units seconds (s), frequency (f) units hertz (Hz) speed (v) units metre/second (m/s) Text Pages 4 - 15

6. Calculations • Frequency = 1/period f = 1/T unit Hertz (Hz) • Speed = wavelength x frequency v = l f unit metre/second (m/s) Assume speed in air 340 m/s unless told other wise.

7. Transverse Waves water waves, light waves*, some seismic waves • In groups role model the movement of particles in a • transverse wave e.g. water wave • Creating a transverse wave Text Page 6 – 8, 27

8. Transverse Wave

9. Longitudinal Wave compression rarefaction sound waves and some seismic waves • In groups role model the movement of particles in a • longitudinal wave e.g. sound wave Creating a longitudinal wave Text Pages 9 – 10,27

10. Tuning Forks Task : Strike each tuning fork on the bench and comment on its sound (pitch, loudness and intensity) • Perceptive and subjective qualities of sound. • Pitch is how high or low a sound seems • (lion low, bird high) • The louder the sound the • more energy the sound • wave has. • Intensity is also linked to • how high and often a wave • occurs. Text Page 42 - 45

11. Key word links amplitude frequency loudness Pitch period wavelength Intensity

12. Speeds of Sound Speed of Sound Text book page 39 http://www.ndt-ed.org/EducationResources/HighSchool/Sound/speedinair.htm

13. Speed of sound • Explain why the speed of sound is not constant (the same) for all materials.

14. Draw waves to represent the following sounds • Soft low frequency sound • Loud high frequency sound • Short wavelength loud sound

15. Describe the two waves below

16. Sound from a Speaker Components of a speaker Loud speaker simulation

17. Sound intensity level and distance Sound waves spread out in all directions decreases intensity.

18. Complete Review Properties of Waves • Draw wave diagrams where needed • Show all working • Remember to place units on calculations • Explanations may be in point form.

19. Hearing Frequencies at which a range of animals can hear Ears work in a similar way to speakers.

20. Interaction of waves with boundaries Reflection Task Use light boxes to prove this rule Prove: angle of incidence = angle of reflection Assessment: Criteria F

21. Interaction of waves with boundaries Refraction Bending and change of speed of waves as they pass from one medium to another. Task Investigate light waves moving from air to plastic. Assessment criteria D and E

22. Summary of Interaction between boundaries Lines represent rays of light

23. How does Homer see the box?

24. Reflection Diffuse Reflection Specula Reflection Smooth surfaces the waves are not spread out Irregular surface means the waves are spread out

25. Electromagnetic Waves An electromagnetic wave consists of vibrating electric and magnetic fields that move through space at the speed of light. The smaller the wavelength the greater their energy These waves can transfer energy with out a medium to travel through. You are only expected to know the basics structure and chacteristics of EM waves. Chapter 3 pages 70 – 71, 74 - 75

26. Page 74 - 75 Page 74

27. Waves around us and their uses Sound Microwaves Sound is used to find objects and depth of oceans Sound barriers use the ideas of reflection to Stop sound pollution Microwaves are used in modern Communication Fibre optics instead of using wires Similar many controls around the house use Microwaves to operate systems. Page 62 Pages 90 - 93

28. Waves and our atmosphere Different wavelength can be used for different types of communication from contacting ET to phoning home.

29. Waves and Health Ultra sound 20 kHz used in the same way as echo sounding. High frequency waves provide heat to help healing. Page 63 X rays are used to to obtain images of solids for example bones Page 79

30. Review Questions from Text Chapter 1 Questions Section 1 Assessment page 10 Question 2 C Section 2 Assessment page 15 Questions 1 & 2 Section 3 Assessment page 23 Questions 1 b Chapter 1 Review and Assessment Review Key terms Question 1 – 4 Chapter 1 Review and Assessment Question 9, 11, 12, 16, 17, 18, 19, 22- 25 Chapter 1 Standardised test prep Questions 1- 3, 6

31. Review Questions from Text Chapter 2 Questions Section 1 Assessment page 41 Question 1, 2 b,c, Section 2 Assessment page 47 Questions 1 a, b, 2 a, b, Section 5 Assessment page 63 Questions 1 c, 2 a, b, c Chapter 2 Review and Assessment Review Key terms Question 2, 5 Chapter 2 Review and Assessment Question 11, 13, 16, 199, 11, 12, 16, 17, 20, 21, 23, 25 Chapter 2 Standardised test prep Questions 1, 2, 4,

32. Review Questions from Text Chapter 3 Questions Section 1 Assessment page 73 Question 1 a, b Section 2 Assessment page 81 Questions 1 a, c, 2 a, b, c Chapter 3 Review and Assessment Review Key terms Question 1, 3, Chapter 2 Review and Assessment Question 11, 14, 25, 26, 27 Chapter 2 Standardised test prep Questions 3, 5,

33. Review Questions from Text Chapter 4 Questions Section 2 Assessment page 118 Questions 1 a,b,c Section 2 Assessment page 123 Questions 1b Chapter 4 Review and Assessment Review Key terms Question 2, Chapter 2 Review and Assessment Question 16 Chapter 2 Standardised test prep Questions 1, 3,