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Q4: _ are emitted when high speed electrons
Q37: An atom can be excited into a
Q46: The _ states that a particle cannot
Q48: The ideal shape for the primary mirror
Q72: The force on a charged object divided
Q91: An electron absorbing an ultraviolet photon will
Q124: When we say charges are 'positive' or
Q124: The ionosphere reflects _ frequency radio waves.
Q129: the aurora borealis is an example of
Q143: can be increased by doing work on