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Light as a Wave: Part 1 SNC2D. What is a wave? A wave is a disturbance which carries energy from one location to another. The material the disturbance.

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Presentation on theme: "Light as a Wave: Part 1 SNC2D. What is a wave? A wave is a disturbance which carries energy from one location to another. The material the disturbance."— Presentation transcript:

1 Light as a Wave: Part 1 SNC2D

2 What is a wave? A wave is a disturbance which carries energy from one location to another. The material the disturbance travels through is the medium. The movement of the disturbance is referred to as propagation.

3 2 Types of Waves A longitudinal wave is a wave in which the particles of the medium move in a direction parallel to the direction of propagation.

4 2 Types of Waves A longitudinal wave is a wave in which the particles of the medium move in a direction parallel to the direction of propagation.

5 2 Types of Waves A transverse wave is a wave in which the particles of the medium move in a direction perpendicular to the direction of propagation.

6 Snapshot of a Wave The dashed line represents the rest positions of the particles.

7 Snapshot of a Wave The positions of maximum displacement are referred to as crests (positive displacement) and troughs (negative). The maximum displacement is the amplitude.

8 Snapshot of a Wave The distance between one crest and the next crest (or one trough and the next trough) is the

9 Snapshot of a Wave The distance between one crest and the next crest (or one trough and the next trough) is the wavelength, represented by

10 Snapshot of a Wave The distance between one crest and the next crest (or one trough and the next trough) is the wavelength, represented by.

11 Snapshot of a Wave The time it takes one complete wavelength to pass a single point is the

12 Snapshot of a Wave The time it takes one complete wavelength to pass a single point is the period, represented by

13 Snapshot of a Wave The time it takes one complete wavelength to pass a single point is the period, represented by T.

14 Snapshot of a Wave The number of complete wavelengths that pass a single point in one second is the frequency, represented by f.

15 Frequency Frequency is measured in units of s -1 or Hertz (Hz). “I do not think that the wireless waves I have discovered will have any practical application.”

16 Wave Speed The speed of a wave is therefore:

17 Wave Speed The speed of a wave is therefore:

18 Wave Speed The speed of a wave is therefore:

19 Wave Speed The speed of a wave is therefore: Practice Question: What is the wavelength of a wave with a speed of 344 m/s and a frequency of 256 Hz?

20 Wave Speed Practice Question: What is the wavelength of a wave with a speed of 344 m/s and a frequency of 256 Hz?

21 Wave Speed Practice Question: What is the wavelength of a wave with a speed of 344 m/s and a frequency of 256 Hz?

22 Wave Speed Practice Question: What is the wavelength of a wave with a speed of 344 m/s and a frequency of 256 Hz?

23 Wave Speed Practice Question: What is the wavelength of a wave with a speed of 344 m/s and a frequency of 256 Hz?

24 Wave Speed Practice Question: What is the wavelength of a wave with a speed of 344 m/s and a frequency of 256 Hz?

25 Wave Speed Practice Question: What is the wavelength of a wave with a speed of 344 m/s and a frequency of 256 Hz?

26 Light is an “EM” wave Light is actually a transverse wave

27 Light is an “EM” wave Light is actually a transverse wave, but the perpendicular-to-propagation disturbance is not of particles of a medium but of the electric and magnetic (EM) fields

28 The Speed of Light Because light waves do not need a medium, they can travel through a vacuum (empty space) and do so at the speed of light: c =

29 The Speed of Light Because light waves do not need a medium, they can travel through a vacuum (empty space) and do so at the speed of light: c = 3.0 x 10 8 m/s.

30 Light-years A light-year is the distance light would travel in 1 year.

31 Light-years A light-year is the distance light would travel in 1 year. Practice Question: How far (in m) is 1.0 light-years?

32 Light-years A light-year is the distance light would travel in 1 year. Practice Question: How far (in m) is 1.0 light-years?

33 The Speed(s) of Light Light will travel slower in denser media (e.g. glass), but the speed in air is still effectively 3.0 x 10 8 m/s and

34 More Practice p. 391 #1 and 2

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