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Q23: A hydrogen atom in a low-density, hot
Q27: In which these parameters does a photon
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Q79: The New Zealand physicist Lord Rutherford and
Q106: The ecliptic crosses the celestial equator<br>A) at
Q141: The number 50,000 is written in scientific
Q199: In which one of these ranges of
Q226: Which was the first satellite to be
Q262: The force of gravity between two objects
Q290: A comet is observed to return to