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
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High mass stars evolve more slowly to the main sequence than lower mass stars
Indicate whether the statement is true or false
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?
A. isotope A B. isotope B
Doubling the power output from a speaker emitting a single frequency will result in what increase in loudness?
a. 0.33 dB c. 4.8 dB b. 3.0 dB d. 9.0 dB
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?
A. 150 nm B. 109 nm C. 90.0 nm D. 438 nm E. 219 nm