6. What is a controlled experiment?
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Ответ:
an experiment in which one variable is changed
Explanation:
Ответ:
a. True
Explanation:
The Bohr model shows the n-2 as the first transitions between the energy states and hydrogen atom which is shown by changes in the electron structure n = 1 1. In this transition period, the electron moves from the n level to the next level, and energy d transmitted.