Unit 5: Being a Physicist Homework

Transcription

1 Unit 5: Being a Physicist Homework Homework Date due Parent/Guardian Signature Mark 1 Waves & Sounds /13 2- Analysing Sound /11 3- Heat & the EM Spectrum /14 4- Conduction & Cooling down /13 5- Convection & Radiation /12 6- Heat loss in the home /9 7- Reflection & Refraction /15 8- Sight & Sight defects /7 Parental Comments S1/2 CfE Science 0

2 Homework 1 MARK /13 % Comment / Grade Find out more Fill in the blanks a) All waves transfer b) Two examples of waves are: o o c) d) The of a wave shows how much is in a wave. 2. Describe an experiment to measure the energy in a water wave. 1

3 3. Fill in the blanks Sounds travel by Sounds can travel through, and but not through a because there are no. (3) Describe and experiment to prove that sound can travel through liquids. Explain how a cup-and-string telephone works 2

4 Homework 2 MARK /11 % Comment / Grade Find out more Fill in the blanks 1. The of a sound is a measure of how many times an object vibrates per second. The units used to measure frequency are called. 2. Sounds above the human range of hearing are known as. They can be used to see in the womb or to find objects under the. 2. You may need to do some research to help you with this homework Find out: a) Bats Navigate in the dark b) Elephants communicate over large distances 3

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7 Homework 3 MARK /14 % Comment / Grade Find out more Fill in the blanks All waves in the electromagnetic spectrum travel at the same. This is meters per second. 2. By applying your knowledge explain why you can see a firework exploding before you hear it exploding? 3. Fill in the blanks 6

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9 5. Fill in the blanks a. Heat is a form of. b. is a measure of how hot or cold something Is and is measured with a. c. Heat can travel easily through but not through. d. Metals are generally conductors of heat. e. and are both insulators. 6. Explain why cooking pots are often made of metal, but their handles are often made of plastic. 8

10 Find out more... Homework 4 MARK /13 % Comment / Grade 1. Fill in the blanks a. Heat energy travels from objects to objects. b. Heat can travel through solids by Heat travels by conduction because the touching particles c. Metals are conductors of heat and non-metals are conductors (i.e. ). 2. A chef wants to find out which type of cooking is best at conducting heat stainless steel or copper-bottomed pots. Design an experiment to find out which metal is a better conductor. (4) 9

11 3. The graph below shows how most substances cool after being taken away from the source of heat. Answer the following questions In the graph: a) Where is the heat loss the greatest: A, B, C or D? b) What is the temperature at point C? c) What is room temperature? d) What is happening at points A, B and C? e) On the same graph, add two cooling lines with the following characteristics: i. same starting temperature, higher room temperature ii. higher starting temperature, lower room temperature 10

12 Find out more... Homework 5 MARK /12 % Comment / Grade 1. Fill in the blanks a. In a fluid, (liquid or gas), heat travels mostly by. b. In convection, hot fluid 2. In the diagram opposite, use arrows to show a convection current. 3. Explain why heated particles rise in hot water 11

13 4. Fill in the blanks a. A lid reduces heat loss by All hot objects emit heat as rays called radiation. b. Infra-red radiation can travel without being present. Infra-red radiation travels very 5. a. and surfaces are good at giving out and absorbing infra-red radiation b. and surfaces make poor emitters and absorbers of infra-red radiation. 6. Explain why cars and buildings in hot countries are often painted white 12

14 Find out more... Homework 6 MARK /9 % Comment / Grade The diagram below shows some ways in which heat is lost in the home and also what can be done to reduce heat loss. solar panels painted matt black shutters to close at night conservatory facing south loft floor covered in glass fibre containing air double glazed cavity walls filled with foam containing air bubbles The table below shows how long it takes for each of these energy saving features to pay for the cost of installing them. Energy saving feature Time to pay for itself Solar panels Double glazing Shutters Conservatory Cavity wall insulation Loft insulation 12 years 10 years 8 years 15 years 5 years 3 years 13

15 1. Use the table on the previous page to help you answer the following questions a. Which energy saving feature is the most cost effective? b. Which energy saving feature is the least cost effective? c. Which feature relies on a renewable form of energy? d. Which feature might be the most useful near an airport? You may need to do some research to help you with this homework 2. Explain how the energy saving features listed below help to save heat energy: a. Conservatory facing south b. Solar panels painted matt black 14

16 c. Loft floor covered in glass fibre containing air d. Double glazed windows e. Cavity walls filled with foam containing air bubbles 15

17 Homework 7 MARK /15 % Comment / Grade Find out more Light is a Complete the diagrams below a. b. c. 16

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19 2. Refraction is: Describe the effect of white light passing through a triangular prism 18

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21 Homework 8 MARK /7 % Comment / Grade Find out more Fill in the blanks a. In normal sight, light enters the eye through the and is the focused on to the by the. b. The changes size depending on the amount of entering the eye. c. The protects the eye. 2. Complete the diagram below for normal sight Label the following: cornea, iris, pupil, lens, retina, optic nerve 20

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