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Key points on Edexcel Physics (P1)

Key points on Edexcel Physics (P1). Visible light and the solar system. Telescopes have allowed a greater detail of planetary bodies to be seen Different telescopes can detect waves from different parts of the EM spectrum Detecting radio/microwaves allows objects not visible to be seen

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Key points on Edexcel Physics (P1)

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  1. Key points on Edexcel Physics (P1)

  2. Visible light and the solar system • Telescopes have allowed a greater detail of planetary bodies to be seen • Different telescopes can detect waves from different parts of the EM spectrum • Detecting radio/microwaves allows objects not visible to be seen • Telescopes contain lenses which change the direction of light rays

  3. The electromagnetic spectrum • Microwaves like light, radio or microwaves do not need a medium to travel • Wave energy increases as wavelength decreases in the EM spectrum • All waves travel at the same speed in a vacuum • Some EM waves can be useful(X-rays) and/or harmful (gamma rays)

  4. Universe • Telescopes have increased our understanding of the universe • Stars go through a life cycle starting with a cloud of dust being pulled together by gravity • The big bang theory is the current accepted model that the universe is expanding • The red-shift and cosmic microwave background radiation are evidences supporting this theory

  5. Waves and the earth • Frequency is the number of waves/vibrations per second (Hertz-Hz). • Infrasound have a frequency of <20Hz and Ultrasound >20KHz • Some animals use infrasound to communicate. Ultrasound is used in scanning and sonar imaging • Seismic waves are produced by earth movements or explosions • P-waves (longitudinal) travel faster and have more energy than S-waves(transverse).

  6. Generation and transmission of electricity • Non-renewable sources of energy are coal, oil, gas and nuclear • Renewable sources of energy are wind, solar, geothermal, waves, tidal, hydro. • Electricity is generated by rotating a coil of wire between two magnets. • The electricity is transmitted via the national grid (power stations>step-up transformers>pylons>step-down transformers>homes/factories

  7. Energy and the Future • Types of include thermal, light, sound electrical, elastic, gravitational, nuclear • Energy transfers take place in most devices and appliances. Example; electrical to heat and light • Energy is not created to destroyed but transformed into another. • The more efficient the device, the more useful energy it transforms. • A constant temperature is achieved when input and output energy are balanced.

  8. Tips • Read through the question twice and understand what is needed. • Start with the question YOU know well NOT always with QUESTION 1 • Do not spend more than 10min on a question. • Show working/Calculations • Read through your answer twice • Attempt all questions • Good luck

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