Lesson 3 — 6.2 + 6.3

• Light 6.1 + 6.2
• Middelbare school
• havo, vwo
• Leerjaar 2

Period 4 — Light

This lesson

• Recap — 6.2
• Studying 6.3
• Discussing 6.3

Goals

• Name the speed of light and it's name in physics
  
• Explain how the speed of light us used as a unit of distance
•  Explain how astronomers use light to study space
•  Be able to do calculations using the speed of light

• During classical explanation – have a question, raise your hand

• While working independently – disturb the class, go to olc 2 for the rest of the lesson with extra work

•  Not participating serious in the class (making noise, inappropriate jokes, etc.) — go to olc 2 with extra work

• After one warning — If you stand out one more time, go to olc 2 with extra work

Science —The coming weeks

•  Next week — Discussing the test + finishing up to and including paragraph 6.3

•  The week after that — electro magnetism practical + paragraph 6.4 

Recap

6.2 Seeing things

Types of light

• Emitted light
  
• Reflected light
  
• Transmitted light
  
• Absorbed light
  

• Transparant
  

• Translucent
  

• Opaque
  

Studying 6.3

• Study §6.3

•  Write down the key concepts

• Write down any questions you have or parts you don't understand

• Make the yellow block and workbook exercises for §6.3

      (an aeroplane travels at a speed of 900 km/h)

The speed of light

• 300 000 000 m/s
  
• this is called 'c'
  

Light — as a distance unit

• Light seconds
  
• light minutes
  
• light hours
  
• light years (ly)
  

Exercise

The closest star to our sun is Proxima Centauri. This star is 40,208,000,000,000 km away from our sun. 

The speed of light is 300 000 000 meters per second

How many light years away is Proxima Centauri from our sun?

• The speed of light = 300 000 000 m/s — called 'c' in physics.
  

• Light is used as a measure of distance (light years).
  

• Astronomy studies the universe through the information in the light that reachers earth.
  

• to measure the speed of light, technology had to invented that measures time in small enough intervals to be able to detect it.
  

• calculations using the speed of light
  

Goals

• Name the speed of light and it's name in physics
  
• Explain how the speed of light us used as a unit of distance
•  Explain how astronomers use light to study space
•  Be able to do calculations using the speed of light