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What is the velocity of a wave if it has a wavelength of 4m and a period of .39s?. Do Now. v = f λ. Bellwork. What is the velocity of a wave if it has a wavelength of 4m and a period of .39s?. v = f λ. Bellwork.

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  1. What is the velocity of a wave if it has a wavelength of 4m and a period of .39s? Do Now

  2. v = fλ Bellwork What is the velocity of a wave if it has a wavelength of 4m and a period of .39s?

  3. v = fλ Bellwork What is the velocity of a wave if it has a wavelength of 4m and a period of .39s? v = f(4)

  4. f = 1/T Bellwork What is the velocity of a wave if it has a wavelength of 4m and a period of .39s?

  5. f = 1/T Bellwork What is the velocity of a wave if it has a wavelength of 4m and a period of .39s? f = 1/.39

  6. f = 1/T Bellwork What is the velocity of a wave if it has a wavelength of 4m and a period of .39s? f = 1/.39 f = 2.56 Hz

  7. v = fλ Bellwork What is the velocity of a wave if it has a wavelength of 4m and a period of .39s? v = f(4)

  8. v = fλ Bellwork What is the velocity of a wave if it has a wavelength of 4m and a period of .39s? v = 2.56(4)

  9. v = fλ Bellwork What is the velocity of a wave if it has a wavelength of 4m and a period of .39s? v = 2.56(4) v = 10.24 m/s

  10. Light & Reflection Electromagnetic waves – a transverse wave consisting of electric and magnetic fields. Ex – Radio waves, micro-waves, light waves and x-rays

  11. Light & Reflection

  12. Light & Reflection Electromagnetic Spectrum

  13. Light & Reflection Electromagnetic Spectrum

  14. Light & Reflection All electromagnetic waves travel at the speed of light. 3.00x108m/s

  15. Light & Reflection Reflection – the turning back of an electromagnetic wave (usually light) at the surface of a substance.

  16. Light & Reflection Texture affects how light reflects.

  17. Light & Reflection Incoming and reflected angles are always equal.

  18. Light & Reflection Flat mirrors are the simplest kind of mirrors. They produce an equal “virtual image” behind the mirror.

  19. Light & Reflection Ray diagrams allow you to predict the virtual image location.

  20. Light & Reflection Step 1 – Draw the situation

  21. Light & Reflection Step 1 – Draw the situation

  22. Light & Reflection Step 2 – Draw a line straight to the mirror.

  23. Light & Reflection Step 2 – extend the ray behind the mirror (dashed line).

  24. Light & Reflection Step 3 – Draw a line from the same point at any angle.

  25. Light & Reflection Step 3 – remember, it bounces back at the same angle. θ θ

  26. Light & Reflection Step 3 – extend the reflected ray behind the mirror (dashed line). θ θ

  27. Light & Reflection Where they intersect is the point of the reflected image you started from. θ θ

  28. Light & Reflection For flat mirrors: do = di (object distance = image distance) di do θ θ

  29. Light & Reflection For flat mirrors: ho = hi (object height = image height) di do ho hi θ θ

  30. Light & Reflection Curved mirrors

  31. Light & Reflection Curved mirrors Concave – an inwardly curved surface, which converges incoming light rays. (image appears in front of mirror)

  32. Light & Reflection

  33. Light & Reflection Curved mirrors Convex – an outwardly curved surface, which diverges incoming light rays. (image appears behind mirror)

  34. Light & Reflection

  35. Light & Reflection Curved Mirror Equation: 1+1=2 do di R do = object distance (m) di = image distance (m) R = radius of curvature (m)

  36. Light & Reflection Curved Mirror Equation 2 1+1=1 do di f do = object distance (m) di = image distance (m) f = focal length (m)

  37. Light & Reflection

  38. Light & Reflection Magnification Equation M =hi=-di ho do ho = object height (m) hi = image height (m)

  39. Magnification tells how big image is • If Magnification is negative then image is upside down

  40. Light & Reflection A concave mirror has a focal length of 33cm. What is the image distance if the object is placed 93cm in front the mirror? Magnification?

  41. Light & Reflection 1+1=1 do di f A concave mirror has a focal length of 33cm. What is the image distance if the object is placed 93cm in front the mirror? Magnification?

  42. Light & Reflection 1+1=1 do di f A concave mirror has a focal length of 33cm. What is the image distance if the object is placed 93cm in front the mirror? Magnification? 1+1=1 93 di 33

  43. Light & Reflection 1+1=1 do di f 1+1=1 93 di 33

  44. Light & Reflection 1+1=1 do di f 1=1- 1 di 33 93

  45. Light & Reflection 1+1=1 do di f Yikes!

  46. Light & Reflection 1+1=1 do di f Sike! (just simplify)

  47. Light & Reflection 1+1=1 do di f 1=1- 1 di 33 93

  48. Light & Reflection 1+1=1 do di f 1= .0303 - 1 di 93

  49. Light & Reflection 1+1=1 do di f 1= .0303 - .0108 di

  50. Light & Reflection 1+1=1 do di f 1= .0195 di

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