Which of the following atoms contains the largest number of protons? (Points : 4) 231Pa 227Ac 232Th 226Ra 222Rn

Which of the following atoms contains the largest number of protons? (Points : 4) 231Pa 227Ac 232Th 226Ra 222Rn

Which of the following atoms contains the largest number of … Read More...

1) If a superalloy jet engine is heated so that its length in each direction expands by 1%, what is its percentage change in volume (assume it is roughly cubic)? Hint: Calculate its volume before and after heating, assuming that its length, height, and width are the same, i.e., a cubic engine. 2) Calculate the density of Al in g/cm3, given that it forms an FCC crystal structure with an atomic radius of 0.143 nm (10-7 cm) and a mass of 27 g/mole. Avogadro’s number is 6.02 x 1023 atoms/mole. Hint: calculate the number of atoms in each cell carefully. 3) Calculate the vacancy concentration in aluminum at 50%, 70%, and 90% of TMP=923 K. Gvf = 0.66 eV, and k = 8.62 x 10-5 eV/K. Calculate ln (nv/N) and 1/T, and plot on a linear scale (hint: should be a straight line). 4) a) If the vacancy concentration in Cu is measured to be 10-5 at 1300K (near its melting point), what is Evf? (assume the pre-exponential factor is 1; ie, nv/N = exp (-Evf/kT) b) What would be the concentration at 650 K? 5) Determine the largest size of an interstitial hole in FCC Fe. RFe = 0.124 nm. Would a C atom sit in an interstitial or substitutional site (rC = 0.077 nm)?

1) If a superalloy jet engine is heated so that its length in each direction expands by 1%, what is its percentage change in volume (assume it is roughly cubic)? Hint: Calculate its volume before and after heating, assuming that its length, height, and width are the same, i.e., a cubic engine. 2) Calculate the density of Al in g/cm3, given that it forms an FCC crystal structure with an atomic radius of 0.143 nm (10-7 cm) and a mass of 27 g/mole. Avogadro’s number is 6.02 x 1023 atoms/mole. Hint: calculate the number of atoms in each cell carefully. 3) Calculate the vacancy concentration in aluminum at 50%, 70%, and 90% of TMP=923 K. Gvf = 0.66 eV, and k = 8.62 x 10-5 eV/K. Calculate ln (nv/N) and 1/T, and plot on a linear scale (hint: should be a straight line). 4) a) If the vacancy concentration in Cu is measured to be 10-5 at 1300K (near its melting point), what is Evf? (assume the pre-exponential factor is 1; ie, nv/N = exp (-Evf/kT) b) What would be the concentration at 650 K? 5) Determine the largest size of an interstitial hole in FCC Fe. RFe = 0.124 nm. Would a C atom sit in an interstitial or substitutional site (rC = 0.077 nm)?

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