AQA GCSE Physics 1 Revision Questions & Answers

AQA GCSE Physics 1 Revision Questions & Answers Absorption - ANSWER: When a wave hits an object and is absorbed the energy of the wave can heat up the object Advantages of Digital over Analogue - ANSWER: Digital signals are affected less by interference and can be easily processed by computers. Advantages of ground based (terrestrial) telescopes - ANSWER: Relatively Cheap. Easy to access for repairs and upgrades. Advantages of Space-based (orbital) telescopes - ANSWER: No atmospheric distortion. Can see parts of the spectrum which are absorbed by the atmosphere (UV and X-ray) Atoms of an element always have the same number of _______ in the nucleus. - ANSWER: protons (e.g. all Carbon atoms have 6 protons) Atoms of different isotopes of an element will have different number of _________ in the nucleus. - ANSWER: neutrons (e.g. carbon-12 has 6 neutrons, carbon-14 has 8 neutrons). Both have 6 protons. Dangers of Alpha Radiation - ANSWER: An alpha source is very dangerous when swallowed or inhaled as alpha particles cannot normally penetrate the skin. Dangers of Beta Radiation - ANSWER: Beta sources are dangerous outside the body as beta radiation can penetrate into internal organs. Disadvantages of ground based (terrestrial) telescopes - ANSWER: Suffer from atmospheric distortion. Can't look at all parts of the EM spectrum (esp. UV and X-ray) Disadvantages of Space-based (orbital) telescopes - ANSWER: Very expensive to launch and maintain. Energy cannot be created or destroyed only transformed into other forms - ANSWER: The principle of conservation of energy Energy converted by a device into the form(s) the device was designed for. - ANSWER: Useful energy Energy converted by a device into the form(s) the device was NOT designed for. - ANSWER: Wasted energy Factors affecting the rate of heat transfer - ANSWER: 1. Temperature difference to the surroundings 2. Surface area 3. Nature of surface (e.g shiny/matt)