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Energy for the Home..  What happens to atoms/matter when it heats up?  What is the difference between Heat energy and temperature?  Why do some objects.

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Presentation on theme: "Energy for the Home..  What happens to atoms/matter when it heats up?  What is the difference between Heat energy and temperature?  Why do some objects."— Presentation transcript:

1 Energy for the Home.

2  What happens to atoms/matter when it heats up?  What is the difference between Heat energy and temperature?  Why do some objects take longer to heat up than others?  If a room is at 19 O C and a cup of hot chocolate is at 45 O C, what will happen to the heat energy and the temperatures?

3 This graph shows the temperature of water as it is heated from ice with constant heat source.  Explain in detail what is happening at each stage of the graph. Include the key terms: ‘specific latent heat’ and ‘specific heat capacity’.

4  What are the 3 ways in which heat is transferred? Explain how heat is transferred for each method using examples.  What is the best method for stopping each of the 3 types of heat transfer?  Looking at the picture of the house, what are some of the methods used to stop heat loss. How do they work?  If wall insulation cost £2000 to install and will save you £150 in heating bills, what is the payback time?

5  Fill in the blanks to in the table below about efficiency.  Give some examples of wasted energy from each of the types of heating from above. Heating system Total energy input (J) Useful energy output (J) Efficiency Electric heater % Gas central heating Wood fire120040%

6  What are the properties of microwaves and infrared waves?  What are the similarities and differences of infrared and microwaves?  How are these waves used to cook food?  In what was are these ways used to communicate?

7  Which signal is digital and which is analogue?  Describe how analogue and digital signals are different.  Why is a digital signal considered better?  What is multiplexing on a digital signal?

8 Fibre optic cables use total internal reflection (TIR).  Explain what happens inside a fibre optic cable. Use the key terms:  Critical angle.  Refraction.  Reflection.  Medium / Material. You should also use diagrams in your explanation.

9 Wireless communication.  List as many forms of wireless communication as you can. What kind of wave does each type use?  How does refraction help wireless signals? Explain with the aid of diagrams  How does diffraction help wireless signals? Explain with the aid of diagrams  How can long distance waves be helped by reflection?

10  Explain the following properties of waves:  Wavelength.  Frequency  Amplitude  Speed.  Crests and troughs.  If a wave is travelling at 340 m/s and has a frequency of 100 Hz, how long is it? (v = f λ)  What are some ways in which light can be used to communicate?

11 Lasers!!!  What makes lasers special?  How is laser used to read a CD?  Does a CD store digital or analogue information? Explain.

12  Ultraviolet (UV) waves are considered dangerous, why is this?  What can UV cause in humans?  What is the natural protection on earth from UV rays?

13 2 main kinds of waves exist in earthquakes (P-waves and S-waves).  Describe in as much detail as you can these two types of waves.


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