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What produces a record of seismic waves? richter scale seismogram barometer seismograph

Taylor's experiment: 1. accurately measured the speed of light 2. locked together the phases of two light sources so that the interference pattern would not shift 3. showed that man's reaction time was much slower than the speed of light 4. showed that individual photons have wave characteristics

Which is the correct symbol for an isotope of iodine with 53 protons and 78 neutrons?