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d.) Helium was first discovered from the absorption spectrum produced by helium in the sun's atmosphere. What is an absorption spectrum?

d.) Helium was first discovered from the absorption spectrum produced by helium in the sun's atmosphere. What is an absorption spectrum?

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d.) Helium was first discovered from the absorption spectrum produced by helium in the sun's atmosphere. What is an absorption spectrum? (vi.) a.) Define the terms impedance, reactance, frequency and phose angle as used in AC theory. b.) If a sinusoidal current of peak value 5A is passed through an AC ammeter, the reading will be A. Explain this.
Transcribed Image Text:d.) Helium was first discovered from the absorption spectrum produced by helium in the sun's atmosphere. What is an absorption spectrum? (vi.) a.) Define the terms impedance, reactance, frequency and phose angle as used in AC theory. b.) If a sinusoidal current of peak value 5A is passed through an AC ammeter, the reading will be A. Explain this.
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