Digital ACT Science Practice Question #1504
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Threshold is where KE transitions from 0 to positive: between 4.0 and 5.0 x 10^14 Hz.
At 4.0 x 10^14 Hz no electrons are ejected; at 5.0 x 10^14 Hz emission occurs with 0.14 eV. The threshold lies between these two values....
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