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.