Newton's Discovery of Light Spectrum
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Questions and Answers

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?

<p>Do not point it at anyone.</p> Signup and view all the answers

What did Isaac Newton discover about white light in 1666?

<p>He discovered that white light could be split into different colours.</p> Signup and view all the answers

What is the range of colours that can be seen in white light called?

<p>The spectrum.</p> Signup and view all the answers

Describe one method to create a rainbow at home.

<p>Use a garden hose and sunlight.</p> Signup and view all the answers

How many colours are generally agreed to be in the spectrum of white light?

<p>Seven</p> Signup and view all the answers

Which colors are visible in the spectrum shown on the screen behind the prism?

<p>Red, orange, yellow, green, blue, indigo, violet.</p> Signup and view all the answers

List the seven colours of the spectrum in order.

<p>Red, Orange, Yellow, Green, Blue, Indigo, Violet</p> Signup and view all the answers

What phenomenon explains the splitting of white light into different colours?

<p>Dispersion</p> Signup and view all the answers

What shape of glass block did Newton use to split the light?

<p>Triangular prism.</p> Signup and view all the answers

Which colour of light is refracted through the largest angle in a prism?

<p>Violet</p> Signup and view all the answers

Which colour of light is refracted through the smallest angle in a prism?

<p>Red</p> Signup and view all the answers

What happens to the colours of light that do not pass through a coloured filter?

<p>They are absorbed.</p> Signup and view all the answers

What colour of light does a red filter transmit?

<p>Red</p> Signup and view all the answers

How many colours are in white light?

<p>Seven</p> Signup and view all the answers

What principle do traffic lights use to display different colours?

<p>Subtraction of light</p> Signup and view all the answers

What color is the lamp in the stage light?

<p>White</p> Signup and view all the answers

What would you observe if a green filter was placed in front of a white light source?

<p>Green light</p> Signup and view all the answers

Which colours are subtracted from white light to produce red light using a red filter?

<p>Orange, yellow, green, blue, indigo, and violet</p> Signup and view all the answers

Why do photographers use coloured filters on their cameras?

<p>To get different effects</p> Signup and view all the answers

Why is the flower seen in yellow?

<p>It reflects only yellow light</p> Signup and view all the answers

What colors of light does a white object reflect?

<p>All colors of light</p> Signup and view all the answers

What happens to light when it hits a black object?

<p>A black object absorbs all colors of light</p> Signup and view all the answers

Why do we see a flower as yellow in color?

<p>The flower reflects the yellow color and absorbs all other colors in white light.</p> Signup and view all the answers

What color does a black object reflect?

<p>A black object does not reflect any color.</p> Signup and view all the answers

Why does a red object appear red to us?

<p>A red object reflects the red color and absorbs all other colors in white light.</p> Signup and view all the answers

What happens to the colors that are not reflected by an object?

<p>The colors that are not reflected are absorbed by the object.</p> Signup and view all the answers

If an object absorbs all colors of light, what color will it appear?

<p>It will appear black.</p> Signup and view all the answers

What are the three primary colours of light?

<p>Red, blue, and green</p> Signup and view all the answers

What colour is produced when red and green light are combined?

<p>Yellow</p> Signup and view all the answers

What colour results from mixing red and blue light?

<p>Magenta</p> Signup and view all the answers

What happens when you combine red, green, and blue light?

<p>White</p> Signup and view all the answers

What are the seven colours that make up white light?

<p>Red, orange, yellow, green, blue, indigo, and violet</p> Signup and view all the answers

How do primary colours in light differ from primary colours in paint?

<p>Colours in light mix differently from the colours in paint.</p> Signup and view all the answers

By placing a red filter in front of a white light source, which colour will be transmitted?

<p>Red</p> Signup and view all the answers

What colour is produced by mixing blue and green light?

<p>Cyan</p> Signup and view all the answers

List the three primary colours of light.

<p>Red, green, blue</p> Signup and view all the answers

Name the colour produced when red light and green light are added together, and when red, green, and blue lights are added together.

<p>Yellow, white</p> Signup and view all the answers

A stage light uses a shine lamp. What colour of light will be seen when a yellow filter is used?

<p>Yellow</p> Signup and view all the answers

A stage light uses a shine lamp. What colour of light will be seen when an orange filter is used?

<p>Orange</p> Signup and view all the answers

A green hall appears green. What two colours of lights could be shining on the green hall?

<p>Blue and green</p> Signup and view all the answers

A blue hall appears black. What two colours of light could be shining on the blue hall?

<p>Red and green</p> Signup and view all the answers

A T-shirt looks red. What explain this?

<p>A, B, D</p> Signup and view all the answers

Identify the primary colours needed to create the following colours: cyan, magenta, yellow.

<p>Cyan: blue and green, Magenta: red and blue, Yellow: red and green</p> Signup and view all the answers

How many stars are estimated to be in the Milky Way galaxy?

<p>250,000,000</p> Signup and view all the answers

What is the definition of the Universe?

<p>All of space and everything in it.</p> Signup and view all the answers

What shape is the Milky Way galaxy?

<p>Spiral</p> Signup and view all the answers

Why do most of the stars we see at night belong to the Milky Way?

<p>Because we are inside the Milky Way galaxy.</p> Signup and view all the answers

What looks like a white band across the sky from Earth?

<p>One arm of the Milky Way's spiral.</p> Signup and view all the answers

What are galaxies made of?

<p>Billions of stars, gas, and dust</p> Signup and view all the answers

What are the different shapes of galaxies?

<p>Spiral, elliptical, and irregular</p> Signup and view all the answers

What force holds the parts of a galaxy together?

<p>Gravity</p> Signup and view all the answers

Where do most of the stars we see in the night sky come from?

<p>Our galaxy</p> Signup and view all the answers

Why can scientists only estimate the number of stars in the Milky Way?

<p>Because the number of stars is too large</p> Signup and view all the answers

Where are the majority of asteroids found?

<p>The majority of asteroids are found in a belt between Mars and Jupiter.</p> Signup and view all the answers

What is the shape of a typical asteroid?

<p>A typical asteroid has an irregular shape.</p> Signup and view all the answers

What clues do asteroids provide about the Solar System?

<p>Asteroids provide clues about the early history of the Solar System.</p> Signup and view all the answers

Which is the largest asteroid and what is it considered?

<p>Ceres is the largest asteroid and is considered a dwarf planet.</p> Signup and view all the answers

What threat do smaller asteroids pose to Earth?

<p>A collision with a smaller asteroid is a threat to planet Earth.</p> Signup and view all the answers

What have some studied asteroids been found to contain?

<p>Some asteroids have been found to have water ice.</p> Signup and view all the answers

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.

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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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