91影视

Choose the correct answer. The difference between the mass number of an isotope and its atomic number is (a)directly related to the identity of the element; (b) the number of electrons; (c) the number of neutrons; (d) the number of isotopes.

Zinc sulfide (ZnS) occurs in the zinc blend crystal structure.How many kilograms of Zn are in 3.82 kg of ZnS?

Name the unidenti铿乪d species, and write each transmutation process in shorthand notation:

(a) gamma irradiation of a nuclide yields a proton, a neutron, and 29Si;

(b) bombardment of 252Cf with 10B yields 铿乿e neutrons and a nuclide;

(c) bombardment of 238U with a particle yields three neutrons and 239Pu.

AH nucleus decays with an energy ofMeV. Convert this energy into (a) electron volts; (b) joules.

Arsenic-decays with an energy of${\mathbf{\text{1.57脳10}}}^{\mathbf{\text{- 15}}}\mathbf{\text{kJ}}$per nucleus. Convert this energy into

(a) eV;

(b) MeV.

Lead-$\mathbf{206}$is the end product of 238U decay. One${}^{\mathbf{\text{206}}}\mathbf{\text{Pb}}$atom has a mass of$\mathbf{\text{205.974440}}$amu. Calculate the binding energy

(a) per nucleon in MeV;

(b) per atom in MeV;

(c) per mole in kJ.

Cobalt-$\mathbf{\text{59}}$is the only stable isotope of this transition metal. One${}^{\mathbf{\text{59}}}\mathbf{\text{Co}}$atom has a mass of$\mathbf{\text{58.933198}}$amu. Calculate the binding energy

(a) per nucleon in MeV;

(b) per atom in MeV;

(c) per mole in kJ.

In what main way is 铿乻sion different from radioactive decay? Are all 铿乻sion events in a chain reaction identical? Explain.

Plutonium "triggers" for nuclear weapons were manufactured at the Rocky Flats plant in Colorado. An$\mathbf{\text{85 - kg}}$ worker inhaled a dust particle containing$\mathbf{1}\mathbf{}\mathbf{\text{渭驳}}$ of ${}_{\mathbf{\text{94}}}{}^{\mathbf{\text{239}}}\mathbf{\text{Pu}}$, which resided in his body for$\mathbf{\text{16h}}({\text{t}}_{\text{1/2}}$ of ${}^{\mathbf{\text{239}}}\mathbf{\text{Pu = 2.41脳10}}^{\mathbf{\text{4}}}\mathbf{\text{yr}}$, each disintegration released $\mathbf{\text{5.15MeV}}$).

(a) How many rads did he receive?

(b) How many grays?

A compound of copper and sulfur contains 88.39 g of metal and 44.61 g of nonmetal. How many grams of copper are in5264 kg of the compound? How many grams of sulfur?