MrN Physics – Private Tuition in GCSE and A level Physics Revision Guide - OCR GCSE Physics Gateway J265 Module P1 Energy for the Home Revision Guide – Look up or work out the answers to these questions P1a Heating Houses What is the difference between temperature and heat? What is a thermogram? Can you rearrange the equation: energy = mass x specific heat capacity x temperature change so you can calculate specific heat capacity? If a kettle supplies 250kJ to 1kg of water (shc 4200 J/kg/°C) how much will the temperature rise? What happens to the energy input when water is boiling, as it doesn’t cause the temperature to rise? P1b Keeping Homes Warm How is energy transferred by each of conduction, convection and radiation? How do you calculate Payback time? Draw a Sankey diagram for a gas heater that has an efficiency of 60% when the useful energy produced is 100kJ. How does home insulation make use of the ideas of conduction, convection and radiation? Give examples such as double glazing, cavity insulation or loft insulation. P1c A Spectrum of Waves Sketch a diagram to show what is meant by amplitude and wavelength. Compare frequency and wavelength of waves and rearrange the equation: wave speed = frequency wavelength so you can calculate frequency. Water waves travel at 5 m/s and have a frequency of 0.6 Hz. What is the wavelength? Name the sections of the electromagnetic spectrum in order of increasing wavelength. What are the differences between reflection, refraction and diffraction? Sketch diagrams to show diffraction from small and large openings. Why do radio telescopes have to be big? MrN Physics – Private Tuition in GCSE and A level Physics Revision Guide - OCR GCSE Physics Gateway J265 P1d Light and Lasers Compare analogue and digital signals. What are the advantages of digital signals? What is Morse code? Sketch a diagram to explain critical angle. How do optical fibres work? Why do lasers produce an intense beam? P1e Cooking and Communicating Using Waves How does a microwave oven heat up food? How is this different from grilling? What is happening to the water particles in a potato in a microwave oven? Are mobile phones and/or mobile phone transmitter masts dangerous? Where might you get poor mobile phone reception? Why is there a limit to the distance that microwaves can be used to transmit information? P1f Data Transmission Why does your TV remote control not change channels on your satellite or cable box? Sketch diagrams to show the effect of noise on each of analogue and digital signals. What is multiplexing? Why have optical fibre communication systems been introduced? P1g Wireless Signals Show on a diagram how radio communication makes use of the ionosphere or a satellite. How are the two systems different? What is interference? What are the advantages and disadvantages of DAB broadcasts? P1h Stable Earth If you get sunburnt in 20 minutes, what factor sun screen will you need to use to stay in the sun for 5 hours? What are our concerns about the ozone layer? Why is there a potential danger? What was the “Montreal Protocol”? How can seismic waves tell us what the inside of the Earth is like? www.mrnphysics.com http://www.ocr.org.uk/qualifications/gcse-gateway-science-suite-physics-b-j265-from-2012/
