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Discover Questions

Why would the absorption spectrum of each element have lines in the same places as in the emission spectrum? A) what is the wavelength of a radio wave that operates at 98.1MHz?
b) what is the period of this wave? What's planet has the thickest atmosphere? The radioactive atom 187/83 Bi decays by alpha particle emission. Write a reaction showing the decay.? Solve each equation by the method of completing the square. Show your work.
Part I: x^2 + 8x = 20 Part II: x^2 − 30x = −125?