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Textbook pages 92-99.  A disturbance that travels through a medium.

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Presentation on theme: "Textbook pages 92-99.  A disturbance that travels through a medium."— Presentation transcript:

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

6

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  Do Workbook pages 49-52


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