)Belowarediagramsforthebrightline(akaatomicemission)spectraoffourelementsandthespectrumofamixtureofunknowngases.

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)Below are diagrams for the bright line (aka atomic emission) spectra of four elements and the spectrum of a mixture of unknown gases.

a. Which element(s) are NOT present in the unknown?

b. Which element(s) ARE present in the unknown?

)Belowarediagramsforthebrightline(akaatomicemission)spectraoffourelementsandthespectrumofamixtureofunknowngases.

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The drawing shows three objects. They are connected by strings that pass over massless and friction-free pulleys.

A charge of -3.55 nC and a charge of -5.65 nC are separated by a distance of 60. Find the position at which a third charge of +7.