The attractive force between protons and neutrons in the nucleus is brought about by the exchange of a virtual pi-meson (m? = 140 MeV/c2). Estimate the longest time a ? can exist in accordance with the uncertainty principle ?E??t = h/2?. (h/2? = 1.05 × 10^?34 J?s, 1 eV = 1.6 × 10^?19 C)
a. 3.3 × 10^?18 s
b. 2.4 × 10^?21 s
c. 4.7 × 10^?24 s
d. 6.9 × 10^?27 s
c
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If a nuclide has a half-life of 100 s, what is the corresponding mean lifetime?
A. 100 s B. 144 s C. 69 s D. 50 s E. 75 s
As a truck moves away from a person with its horn blowing, the person hears a frequency ______________ than that of the horn
Fill in the blank(s) with correct word
Once a terrestrial planet had formed from a large number of planetesimals, heat could have melted it and allowed it to differentiate into a metallic core of ____________density and a rocky mantle or crust of ____________ density
a. higher; lower b. lower; higher c. Wrong! The interior stays solid. d. Wrong! There is no separation according to density.
Which of the following is not related to the other four?
a. amino acids b. nucleotides c. five-carbon sugars d. phosphate groups e. nitrogenous bases