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Found that sound does not travel in a vacuum.
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Gravity explained Kepler's observations on the behaviour of satellites.
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Concept of escape velocity
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Edward Jenner vaccinated a child against smallpox.
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This was the beginning of stored electricity.
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R=V/I
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Proved cathode rays were negatively charged particles with a mass 1/1800 of the mass of a proton (Hydrogen nucleus)
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Planck proposed that E=hf
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Lenard used the stopping voltage (qV) to measure the kinetic energy of electrons released by the photoelectric effect.
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This was the birth of quantum physics. Einstein used Planck's formula to explain the photoelectric effect.
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Einstein & Speed of LightEinstein used a Gedanken about an observer on a train and another on the platform to analyse the speed of light through the aether. He decided that 2 apparently contradictory results would both occur. He stated that the speed of light is the same in all frames of reference, hence people in inertial frames of reference in relative motion will experience space and time differently.
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Hubble identified that the spectrum of distant stars is redshifted and related this to the doppler effect.
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