Physics P1 0.0 / 5 ? PhysicsEnergy for the homeGCSEOCR Created by: siantoppCreated on: 10-12-13 17:58 What are the units for temperature and energy? Temperature is celsius. Energy is joules 1 of 16 On a thermogram, one item is blue and one item is yellow. Which object gives out the most heat energy? Hottest areas appear white yellow and red, coldest areas appear black blue and purple 2 of 16 Which type of insulation has the longest time for payback? Double glazing 3 of 16 What are the useful energies produced by television? Light energy, Sound energy and Electric energy 4 of 16 What is meant by the frequency of a wave? Frequency is the number of waves produced in one second 5 of 16 Name two electromagnetic waves with a shorter wavelength than visible light Ultraviolet rays and Gamma rays 6 of 16 What is the condition needed for maximum diffraction? Maximum diffraction occurs when the gap is the same width as the wavelength of the wave passing through it 7 of 16 What are 3 uses of microwaves? Cooking food, Satellite communication and for mobile phones 8 of 16 What type of molecules in foods absorb microwaves? Water and fat molecules 9 of 16 What happens to light when it hits a glass- air boundary at an angle above the critical angle of substance? It is totally internally relfected 10 of 16 Which type of seismic wave cannot travel through the liquid outer core of the Earth? S-waves 11 of 16 Does deforestation contribute to global warming? Yes because getting rid of trees increases the co2 levels in the atmosphere 12 of 16 What is specific heat capacity? How much energy a material can handle. It is the energy needed to raise the temperate of 1kg by 1 degree celsius 13 of 16 What is the efficiency of a lightbulb that used 100 joules of energy every second to produce 20 joules of light energy? efficiency=(usefuloutput/totalinput) x 100. efficiency= 20% 14 of 16 How are microwaves used to heat food? They are absorbed by the fat and water molecule allowing the substance to heat up and they penetrate around 1cm into food 15 of 16 What are the two main types of seismic wave? p-waves and s-waves. s-waves cannot pass through the liquid part of the core 16 of 16
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