Name: Number: Class: Date: What is light? 1. What is the name for all these types of light? 2. What type of light can humans see?

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1 Name: Number: Class: Date: What is light? Worksheet 1 1. What is the name for all these types of light? 2. What type of light can humans see? 3. What type of light has the longest wavelength? 4. What types of light are the most dangerous? 5. What light is used to cook food? 6. What light gives you a sun tan? 7. Warm things give out what type of light? 8. All types of light travel at what speed? In class you will make a colour spinner. 1. What colour do you see when you spin the spinner? 2. How many colours are there in white light? 3. In the box below draw the colours of the spectrum.

2 How to Make a Colour Spinner 1. Colour each section with one of the colours of the visible light spectrum. It is best to use a light colour. Red Orange Yellow Green Blue Indigo (blue purple) Violet (pinkish purple) 2. Stick your disc onto card. 3. Cut out the disc shape with scissors. 4. Make a small hole in the middle of the disc and push a sharp pencil through it. 5. Spin the disc and see what happens! wavelength visible light spectrum electromagnetic spectrum mix waves speed 7 colours straight lines 4. Write a paragraph about what visible light is made of and how it travels. (Use the words from the box and information from your Science booklet)

3 Name: Number: Class: Date: Mediums of Light Worksheet 2 1. Use a torch light to find out what type of medium the different objects are. Name of Object How much light can pass through? (all, some or none?) Type of Medium (transparent, translucent or opaque) rock none opaque clean water white paper leaf 2. Draw a design for a new car. Label what transparent, translucent and opaque materials you would use and why you would use them.

4 Name: Number: Class: Date: Reflection and Refraction 1. Use the words in the box to complete the sentences below. Worksheet 3 law incidence reflection Diffuse reflection Regular i) When light hits a surface and bounces off, it is called. ii) reflection is when light hits a bumpy surface and bounces off everywhere. iii) reflection is when light hits a smooth or flat surface and bounces off in straight lines. iv) The of reflection states that the angle of is equal to the angle of. 2. Use the words in the box to label the diagram of light reflection and refraction. reflected ray incident ray reflection refraction incidence refracted ray air i r boundary water R i = angle of r = angle of R = angle of

5 3. Place a straw in a beaker of water then carefully draw and label diagrams of what you observe. Straw standing in the middle. Straw leaning against the side. 4. Use the words in the box to help you complete the sentences below. Concave Convex lens Divergence Convergence a) A is a curved piece of transparent material used to refract light. b) lenses are thick in the middle and thinner on the outside. c) lenses are thin in the middle and thicker on the outside. d) occurs when light rays come together. e) occurs when light rays spread out in different directions. 5. What are these types of lens called? 6. What type of lens would you use in a telescope and why? (Use the Science words from question 4)

6 Name: Number: Class: Date: Laser Light 1. Complete the acronym for Laser below. Worksheet 4 Letter Word Meaning L Light A type of electromagnetic energy. A S E R 2. Use colour pencils to show the light waves below. White light Red filtered light Red laser light

7 3. Write a paragraph about why laser light can travel very far. one wavelength in step powerful straight 4. Try to find all the laser words in this word search. v y c n n w m u z s t q p u l o a r a i a h v o t y i v i e e g g s w t o t e s n s b i e e i s a l w o z a l g r n r c e g i l s l a f g a i n f s y i n s u t t f g k s g n d s l n o i t a i d a r e v k m l h g m a g r m z l s p o j e l r u Find these words! amplification laser light powerful radiation ruby stimulated wavelength atoms beam emission s s t i m u l a t e d y b u r a y g r e n e

8 Name: Class: Number: Date: Worksheet 5 Light Review A. Circle the correct answer to these questions. 1. White light is a mixture of: a) 3 colours b) 9 colours c) 6 colours d) 7 colours 2. Light will not travel through: a) the atmosphere b) a translucent medium c) an opaque medium d) water 3. The speed of light is approximately: a) m/s b) mm/s c) km/s d) cm/s 4. One type of reflection is regular reflection. The other type of reflection is: a) bouncy reflection b) different reflection c) diffuse reflection d) mirror reflection 5. Light travels at different speeds through different mediums. This change in speed is called: a) reflection b) shadow c) refraction d) light speed B. Complete these sentences about reflection and refraction. bounces bending speeds angle of reflection bending Refraction is the of light when it travels from one medium to another. Refraction happens because light travels at different in different mediums. Reflection is when a light ray hits an object and off it. The law of reflection tells us that the angle of incidence is always equal to the.

9 C. Label the diagram below showing reflection and refraction of light. refracted ray angle of reflection reflected ray angle of incidence incident ray angle of refraction boundary air i r water R refracted ray i = angle of incidence r = R = D. Complete the labels to describe what is happening to the light in each diagram. diverging rays concave lens converging rays convex lens converging rays

10 E. Name the medium of light opaque, translucent or transparent in each picture. translucent F. Draw and label diagrams to show how refraction works below. A straw standing in the middle of a beaker. A straw leaning in a beaker of water. E. Write a paragraph about the electromagnetic spectrum using words in the box. waves energy radio waves visible light x-rays electromagnetic radiation

11 Name: Number: Class: Date: What is Electricity? 1. Use the words in the box to complete the paragraph below. Worksheet 6 electrons neutral nucleus neutrons protons negative Protons electrons The central part of an atom is called the. It contains and. Orbiting around the outside are. Electricity is a form of energy produced by the movement of. Neutrons carry a charge. carry a positive charge while electrons carry a charge. 2. Draw a diagram of an atom with 2 electrons (red), 2 protons (blue) and 2 neutrons (green). Draw a + or a to show the charge of the electrons and protons.

12 Name: Number: Class: Date: Static Electricity Experiment 1 - Rub a plastic pen on your shirt for about 30 seconds. i) What happens if you put the pen very close to some small pieces of paper? Worksheet 7 ii) Explain why this happens and draw and label a diagram showing the + and charges. Experiment 2 Rub a balloon on your shirt for about 30 seconds. i) What happens when you bring the balloon near your friend s hair? ii) Explain why this happens and draw and label a diagram showing the + and charges.

13 Name: Number: Class: Date: Current Electricity Worksheet 8 1) Draw a diagram of a circuit. Label the parts and show which way the current is flowing around the circuit. Write a + and on the battery. 2. Test different items to see which materials conduct electrical current. Material Bulb lights up Conductor or Insulator Copper wire yes conductor 3. What type of electricity is used in a circuit? 4. What materials does a circuit need to be made of? 5. Why can electricity flow through conductors?

14 Name: Class: Number: Date: Sources of Electricity 1) Write under each picture if these sources of electricity are renewable or non-renewable. coal solar oil wind nuclear 2) Fill the gaps to explain how turbines work. generator turn steam nuclear reaction moving A turbine is a machine that uses the movement of a liquid or gas. Different things can be used to make the turbine. In wind farms and hydroelectric dams a turbine is turned by the wind or water. In a fossil fuel power station coal, gas or oil is burnt to make a lot of heat. The heat turns water into which makes a turbine turn. In a nuclear power station a material called uranium is used to make a. This makes heat that turns water into steam and makes a turbine turn. In a power station a turbine is joined to a that make electricity. 3) Complete the table to show what turns the turbine in each power station. Source of electricity What makes the turbine turn? (water, air or steam) Coal power station steam Wind farm Nuclear power station Hydroelectric dam Gas power station Worksheet 9

15 4) Draw pictures to show how a hydroelectric dam makes electricity. 1. Water is stored behind a dam in a big lake called a reservoir. 2. A gate is opened in the dam so that water can flow through a channel to a turbine. 3. The water pushes past the turbine making it turn. 4. The turbine is connected to a generator that makes electricity. 5) Draw pictures to show how a coal power station makes electricity. 1. Coal burns to make a lot of heat. 2. The heat turns water into steam. 3. The steam makes a turbine turn. 4. The turbine is connected to a generator that makes the electricity. Find out more by looking at the animations on the London Science Museum website: