It is 39 trillion miles to the nearest star beyond the sun. Expressed in powers of ten, this is

A) 3.9 × 1013. B) 3.9 × 109. C) 3.9 × 1010. D) 3.9 × 1012.


A

Physics & Space Science

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Radioactive Decay: Isotope A has a decay constant of 0.723 s-1 and isotope B has a decay constant of 0.514 s-1. Which isotope has a longer half-life?

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Doubling the power output from a speaker emitting a single frequency will result in what increase in loudness?

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A thin film of soapy water, n = 1.37, is held vertical. Light of wavelength 600 nm is reflected from the film and horizontal dark lines appear. What is the thinnest soap film for which a bright band will occur?

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