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Optical scanners at the grocery store often use He-Ne ______________.
Q19: Who developed the quantum theory in 1900
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Q72: Balance the chemical equation: PCl<sub>5</sub> +
Q74: A lens that is thicker at the
Q91: What is the wavelength in meters, of
Q107: Magnetism results from<br>A) the movement of magnetic
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Q173: Arrange the atoms magnesium, fluorine, strontium, and