1. Textbook pages 92-99

2.  A disturbance that travels through a medium

3.  Medium: a substance that carries the disturbance from one location to another

4.  A disturbance that travels through a medium  Medium: a substance that carries the disturbance from one location to another ▪ How? The particles of the medium interact with particles next to them allowing the disturbance to travel Examples of a medium  Water  Air  Ground

5.  Transports energy from one place to another

7.  Particles of the medium are only temporarily displaced from the rest position

8.  Transports energy from one place to another  Particles of the medium are only temporarily displaced from the rest position ▪ Does not transport matter

9.  Propagation  Amplitude  Wavelength  Frequency

10.  Waves are distinguished by the way they propagate through a medium

11.  Transverse Waves  Propagates perpendicular to the motion of the medium

12.  Transverse Waves Equilibrium

13.  Longitudinal Waves  Propagates parallel to the motion of the medium

14.  Longitudinal Waves  Propagates parallel to the motion of the medium

15.  Longitudinal Waves  Propagates parallel to the motion of the medium

16.  Longitudinal Waves  Propagates parallel to the motion of the medium

17.  Related to the amount of energy transferred by a wave

18.  Transverse Waves  Maximum distance travelled by a particle in the medium compared to its equilibrium position Equilibrium

19.  Transverse Waves  Depends on energy transmitted by the wave ENERGYAMPLITUDE

20.  Longitudinal Waves  How tightly the medium is pushed together at the compressions

21.  Longitudinal Waves  Depends on the density of compression DENSITYAMPLITUDE

22.  Length of a wave’s complete cycle  Transverse Waves

23.  Length of a wave’s complete cycle  Longitudinal Waves

24.  Number of cycles per unit of time  Measured in Hertz (Hz) – the number of cycles per second  1 Hz = completes one full cycle in one second

25.  Speed of a wave depends on  Medium it travels in  Temperature

26.  Speed = frequency x wavelength

27.  v = f x  v = speed (m/s)  f = frequency (Hz)  = wavelength (m)

28.  What is the speed of a sound wave that has a wavelength of 2.00m and a frequency of 170.5Hz?

29. f = 170.5Hz = 2.00m

30.  What is the speed of a sound wave that has a wavelength of 2.00m and a frequency of 170.5Hz? f = 170.5Hz = 2.00m v = ?

31.  What is the speed of a sound wave that has a wavelength of 2.00m and a frequency of 170.5Hz? f = 170.5Hz = 2.00m v = ? v = f x

32.  What is the speed of a sound wave that has a wavelength of 2.00m and a frequency of 170.5Hz? v = (170.5Hz)(2.00m) v = 341 m/s f = 170.5Hz = 2.00m v = ? v = f x

33.  What is the speed of a sound wave that has a wavelength of 2.00m and a frequency of 170.5Hz? v = (170.5Hz)(2.00m) v = 341 m/s f = 170.5Hz = 2.00m v = ? v = f x The speed of the sound wave is 341 m/s

34.  Mechanical Waves  Electromagnetic Waves

35.  Can only propagate in a medium

36.  How? A disturbance changes the physical shape of the medium and passed onto neighbouring particles

37.  Can only propagate in a medium  How? A disturbance changes the physical shape of the medium and passed onto neighbouring particles  Examples: water waves, sound waves, seismic waves

38.  Can propagate in a medium and a vacuum

39.  Carry Radiant Energy

40.  Can propagate in a medium and a vacuum  Carry Radiant Energy  Examples: light waves in space

41.  Categories of electromagnetic waves  Classified by frequency and wavelength FREQUENCYENERGY

42. Long Low Short High

43.  Radio Waves  Smallest frequency  Invisible & transport little energy  Example: Radio, Television, Microwaves, Cellphones

44.  Infrared  Invisible, but feel the warmth emitted  Example: Night vision goggles, short-distance communication (wireless keyboards, remote controls, etc.)

45.  Visible Light  Only electromagnetic waves that can be seen by humans  Together, colours make up white light  Example: Photography, movies, computer screens

46.  Ultraviolet Rays (UV)  Invisible to humans  Greater frequency, transport more energy  Responsible for suntans, but can cause cancer  Example: sterilization of surgical instruments, treatments

47.  X-Rays  High frequency  Able to travel through media opaque in visible light  Example: baggage inspection, radiography

48.  Gamma Rays  Highest frequency and transports the highest energy  Travel easily through matter  Can cause burns, cancer, and genetic mutations  Example: cancer treatment, food preservation

49.  Read Textbook pages 92-99  Do Workbook pages 49-52