c i The data the double glazing company produced is checked and confirmed

C i the data the double glazing company produced is

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4 (c) (i)The data the double glazing company produced is checked and confirmed independently by other scientists.Suggest why it is important to confirm the data independently. ............................................................................................................................................ ............................................................................................................................................ (1 mark) 4 (c) (ii)A homeowner is going to replace his old single-glazed windows with new double-glazed windows.Discuss the cost of fitting double glazing using better insulating glass compared with double glazing using normal glass.Use the information given in the tables. ............................................................................................................................................ ............................................................................................................................................ ............................................................................................................................................ ............................................................................................................................................ ............................................................................................................................................ ............................................................................................................................................ ............................................................................................................................................ ............................................................................................................................................ (3 marks) ____ 8 Turn over for the next question
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14 Do not write outside the box G/K83986/Jun12/PH1HP (14) 5 Radio waves and microwaves are two types of electromagnetic wave. Both waves: can be used for communications travel at the same speed through air. 5 (a) Give two more properties that are the same for both radio waves and microwaves. 1 ......................................................................................................................................... ............................................................................................................................................ 2 ......................................................................................................................................... ............................................................................................................................................ (2 marks) 5 (b) Some satellites are used to transmit television programmes. Signals are sent to, and transmitted from, the satellites using microwaves.What is the property of microwaves that allows them to be used for satellite communications? ............................................................................................................................................ ............................................................................................................................................ (1 mark) 5 (c) Terrestrial television does not use satellites. Terrestrial television signals and radio signals both use radio waves. Radio signals are transmitted at a longer wavelength than terrestrial television signals. Long-wavelength waves (radio signals) Direction of waves Short-wavelength waves (terrestrial television signals)
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15 Do not write outside the box In hilly areas it may be possible to receive radio signals but not receive terrestrial television signals. Explain why. ............................................................................................................................................ ............................................................................................................................................ ............................................................................................................................................ ............................................................................................................................................ ............................................................................................................................................ ............................................................................................................................................ (3 marks) 5 (d)Electromagnetic waves travel at a speed of 3.0 108m/s.A radio station transmits waves with a wavelength of 2.5 102m.Calculate the frequency of the radio waves.Use the correct equation from the Physics Equations Sheet.Show clearly how you work out your answer and give the unit.
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16 Do not write outside the box G/K83986/Jun12/PH1HP 6 The diagram shows a metal pan being used to heat water. Gas flame Energy from the gas flame is transferred through the metal pan by conduction. Explain the process of conduction through metals. ............................................................................................................................................ ............................................................................................................................................ ............................................................................................................................................ ............................................................................................................................................ ............................................................................................................................................ ............................................................................................................................................ (4 marks) ____ 4 (16)
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17Do not write outside the box7The diagram shows a model used to demonstrate an illusion known as ‘Pepper’s Ghost’.A small light bulb and thin sheet of glass are put inside a box. The thin sheet of glass acts as a mirror. Although the light bulb is switched on, a student looking into the box cannot see the bulb. What the student does see is a virtual image of the bulb.View from aboveLight bulbThin sheet of glassacting as a mirrorStudent’s eyeBox7 (a)Use a ruler to complete a ray diagram to show how the image of the light bulb is formed. Mark and label the position of the image. G/K83986/Jun12/PH1HP Turn over
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