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A problem with the Bohr model of the atom is that electrons circling the nucleus
Been
A past participle of the verb "be," indicating a state of existence or occurrence in the past.
You're
You're is a contraction for "you are."
Set
A collection of distinct objects, considered as an object in its own right in mathematics, or the scenery for a film or theater production.
Then
Used to indicate what happened or happens next in a sequence of events.
Q12: A mass spectrometer separates<br>A)ions of different elements.<br>B)different-mass
Q18: Two spaceships approaching each other move at
Q22: The Lorentz factor, γ,<br>A)is always greater than
Q30: To study the energy of photoelectrons we
Q47: The greenish blue of water is evidence
Q51: A new Moon appears in the sky
Q57: Which has more energy per photon?<br>A)red light<br>B)blue
Q58: Between the consumer and the power plant,
Q60: The half-life of a radioactive substance is
Q96: Refraction results from differences in light's<br>A)frequency.<br>B)incident angles.<br>C)speed.<br>D)all