62 Questions
What object is used to split white light in the experiment?
A glass prism
How does white light behave when it enters and exits the glass prism?
It exits as a spectrum of colors.
What is the name of the process that separates white light into colors in the experiment?
Dispersion
What should you avoid doing with a laser pointer to ensure safety?
Do not point it at anyone.
What did Isaac Newton discover about white light in 1666?
He discovered that white light could be split into different colours.
What is the range of colours that can be seen in white light called?
The spectrum.
Describe one method to create a rainbow at home.
Use a garden hose and sunlight.
How many colours are generally agreed to be in the spectrum of white light?
Seven
Which colors are visible in the spectrum shown on the screen behind the prism?
Red, orange, yellow, green, blue, indigo, violet.
List the seven colours of the spectrum in order.
Red, Orange, Yellow, Green, Blue, Indigo, Violet
What phenomenon explains the splitting of white light into different colours?
Dispersion
What shape of glass block did Newton use to split the light?
Triangular prism.
Which colour of light is refracted through the largest angle in a prism?
Violet
Which colour of light is refracted through the smallest angle in a prism?
Red
What happens to the colours of light that do not pass through a coloured filter?
They are absorbed.
What colour of light does a red filter transmit?
Red
How many colours are in white light?
Seven
What principle do traffic lights use to display different colours?
Subtraction of light
What color is the lamp in the stage light?
White
What would you observe if a green filter was placed in front of a white light source?
Green light
Which colours are subtracted from white light to produce red light using a red filter?
Orange, yellow, green, blue, indigo, and violet
Why do photographers use coloured filters on their cameras?
To get different effects
Why is the flower seen in yellow?
It reflects only yellow light
What colors of light does a white object reflect?
All colors of light
What happens to light when it hits a black object?
A black object absorbs all colors of light
Why do we see a flower as yellow in color?
The flower reflects the yellow color and absorbs all other colors in white light.
What color does a black object reflect?
A black object does not reflect any color.
Why does a red object appear red to us?
A red object reflects the red color and absorbs all other colors in white light.
What happens to the colors that are not reflected by an object?
The colors that are not reflected are absorbed by the object.
If an object absorbs all colors of light, what color will it appear?
It will appear black.
What are the three primary colours of light?
Red, blue, and green
What colour is produced when red and green light are combined?
Yellow
What colour results from mixing red and blue light?
Magenta
What happens when you combine red, green, and blue light?
White
What are the seven colours that make up white light?
Red, orange, yellow, green, blue, indigo, and violet
How do primary colours in light differ from primary colours in paint?
Colours in light mix differently from the colours in paint.
By placing a red filter in front of a white light source, which colour will be transmitted?
Red
What colour is produced by mixing blue and green light?
Cyan
List the three primary colours of light.
Red, green, blue
Name the colour produced when red light and green light are added together, and when red, green, and blue lights are added together.
Yellow, white
A stage light uses a shine lamp. What colour of light will be seen when a yellow filter is used?
Yellow
A stage light uses a shine lamp. What colour of light will be seen when an orange filter is used?
Orange
A green hall appears green. What two colours of lights could be shining on the green hall?
Blue and green
A blue hall appears black. What two colours of light could be shining on the blue hall?
Red and green
A T-shirt looks red. What explain this?
A, B, D
Identify the primary colours needed to create the following colours: cyan, magenta, yellow.
Cyan: blue and green, Magenta: red and blue, Yellow: red and green
How many stars are estimated to be in the Milky Way galaxy?
250,000,000
What is the definition of the Universe?
All of space and everything in it.
What shape is the Milky Way galaxy?
Spiral
Why do most of the stars we see at night belong to the Milky Way?
Because we are inside the Milky Way galaxy.
What looks like a white band across the sky from Earth?
One arm of the Milky Way's spiral.
What are galaxies made of?
Billions of stars, gas, and dust
What are the different shapes of galaxies?
Spiral, elliptical, and irregular
What force holds the parts of a galaxy together?
Gravity
Where do most of the stars we see in the night sky come from?
Our galaxy
Why can scientists only estimate the number of stars in the Milky Way?
Because the number of stars is too large
Where are the majority of asteroids found?
The majority of asteroids are found in a belt between Mars and Jupiter.
What is the shape of a typical asteroid?
A typical asteroid has an irregular shape.
What clues do asteroids provide about the Solar System?
Asteroids provide clues about the early history of the Solar System.
Which is the largest asteroid and what is it considered?
Ceres is the largest asteroid and is considered a dwarf planet.
What threat do smaller asteroids pose to Earth?
A collision with a smaller asteroid is a threat to planet Earth.
What have some studied asteroids been found to contain?
Some asteroids have been found to have water ice.
Study Notes
Newton's Discovery about Light
- In 1666, Isaac Newton made a significant discovery about light, splitting it into different colors using a triangular prism.
- White light can be split into a range of colors, known as a spectrum, which includes red, orange, yellow, green, blue, indigo, and violet.
Dispersion
- Dispersion is the process of splitting light into different colors, which occurs because light is refracted at slightly different angles.
- This can be demonstrated using a triangular prism, where violet light is refracted at the largest angle and red light at the smallest angle.
The Experiment
- A glass prism is used to split white light into its different colors, which are then projected onto a screen.
- The prism separates white light into seven colors: red, orange, yellow, green, blue, indigo, and violet.
Primary Colours of Light
- There are three primary colours of light: red, blue, and green, which cannot be made by mixing other colors of light.
- These primary colours can be combined to produce other colors, such as yellow (red + green), magenta (red + blue), and cyan (blue + green).
Subtracting Colours of Light
- Coloured filters can be used to subtract certain colours of light, allowing only specific colours to pass through.
- For example, a red filter absorbs all colours except red, while a yellow filter absorbs all colours except yellow.
Seeing Colour
- Objects appear in different colours because they reflect certain wavelengths of light and absorb others.
- For example, a yellow flower reflects yellow light and absorbs other colours, while a black object absorbs all colours and reflects none.
Light
- Light is made up of different colours, which can be separated using a prism or combined to produce different colours and shades.
- Different colours of light can be produced by using filters or by shining light through coloured objects.
Galaxies
- The Milky Way is a spiral galaxy, consisting of an estimated 250,000,000 stars, including the Sun.
- There are different shapes of galaxies, including spiral, elliptical, and irregular galaxies.
Asteroids
- Asteroids are rocky fragments that orbit the Sun, found primarily between Mars and Jupiter.
- They provide clues about the early history of the Solar System and can have irregular shapes due to collisions with other celestial bodies.
Learn about Isaac Newton's 1666 discovery that white light can be split into different colors. How did he use a prism to demonstrate this phenomenon?
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