Lesson 5 — 6.3


Science P4

The speed of light
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The speed of lightMiddelbare schoolhavo, vwoLeerjaar 2

This lesson contains 31 slides, with interactive quizzes, text slides and 2 videos.

Items in this lesson


Science P4

The speed of light

Slide 1 - Slide

This lesson
  • Quiz about the speed of light
  • What we have to learn about the speed of light this lesson
  • Bonus: How was the speed of light first measured?


Slide 2 - Slide

Goals
  • The symbol of speed of light 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

Slide 3 - Slide

  • During class – have a question, raise your hand.

  • When working  together, do not talk with or shout to people on the other side of the class.

  • While working independently, do not disturb the class.

  •  Participate seriously in the class (also when working with our phones). do not make noise, inappropriate jokes, chat with everyone around you, shout through the class, etc.

  • After one warning, when you break the rules again— You go to olc 2 with extra work.

Slide 4 - Slide

Agreements from previous lesson
  • The classes in the coming two weeks will be more interactive (Kahoot, quizzes, things like that).

  • There will be more demonstrations in the sciences classes.

  •  Working in pairs or groups more.

  • We will keep up the current rules

  • If this works well for the coming two weeks, we will continue this.

Slide 5 - Slide

The speed of light

Slide 6 - Slide

What is the speed of light?
A
5 000 km/s
B
Instant
C
Unknown
D
300 000 000 m/s

Slide 7 - Quiz

The speed of light is the absolute maximum
A
Correct
B
You can never know, maybe something can go faster
C
There is no way to know
D
Incorrect

Slide 8 - Quiz

Since the speed of light is so unique in Physics, it has been given a name. What is this name?
A
S/L
B
c
C
Max. Speed
D
Absolute speed

Slide 9 - Quiz

Why 'c'?
Comes from 'Celerity'

Latin for swift

Slide 10 - Slide

The light of the sun reaches the earth instantly.
A
True
B
False

Slide 11 - Quiz

If a person runs towards a light ray, they will measure the speed of light to be?
A
Exactly the speed of light
B
The speed of light + his running speed
C
slower than the speed of light

Slide 12 - Quiz

If a rocket traveling at 50% the speed of light towards a light ray, they will measure the speed of light to be?
A
Exactly the speed of light
B
The speed of light + it's traveling speed
C
slower than the speed of light

Slide 13 - Quiz

If a rocket traveling at 50% the speed of light away from a light ray, they will measure the speed of light to be?
A
Exactly the speed of light
B
The speed of light - it's traveling speed
C
slower than the speed of light

Slide 14 - Quiz

Astronomy

Slide 15 - Slide

A light year is a unit of...?
A
time
B
speed
C
distance

Slide 16 - Quiz

Light is the only thing that can be measured for astronomers to use to study the universe
A
There must be more the can measure to study the universe.
B
Light is the main thing , but there are several other ones.
C
Light is the only thing that can be measured to study the universe.
D
Light is the main , but there is one other thing.

Slide 17 - Quiz

If you look up to the stars, the things you see are
A
Exactly the way they are in space
B
You are looking into the past

Slide 18 - Quiz

Slide 19 - Slide

Slide 20 - Slide

Slide 21 - Slide

6.3 The speed of light

Slide 22 - Slide


The speed of light

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

Slide 23 - Slide

Light — as a distance unit
  • Light seconds
  • light minutes
  • light hours
  • light years (ly)

Slide 24 - Slide

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 m/s

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

Slide 25 - Slide

  • 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

Slide 26 - Slide

Slide 27 - Video

Study §6.4

Reflection

Slide 28 - Slide

Search for: 
Phet bending Light 

Slide 29 - Slide

Slide 30 - Video

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

Slide 31 - Slide