Problem 54E

A 0.22-caliber handgun fires a 27 g bullet at a velocity of 765 m/s. Calculate the de Broglie wavelength of the bullet. Is the wave nature of matter significant for bullets?

Solution 54E(i) TrueThe energy change that happens when an electron is added to a gaseous atom is called aselectron affinity.Here an electron is being added to Ca , so the reaction represents electronaffinity for Ca . +(ii)True Electron affinity for Ca ion is given by + -Ca (g)+ e Ca ------>(g)ation 1The first ionization energy of the Ca atom is given by the equationCa Ca + + e ------> equation 2 (g) (g)Since euation 1 is the reverse of equation 2 , they both have the same magnitude and differs onlyin their signs.Ionization energy has positive sign and electron affinity has negative sign.(iii)False +Electron affinity for Ca ion is given byCa + + e Ca ------> equation 1 (g) (g)Electron affinity for Ca atom is given by - - Ca (g) Ca (g)-----> equation 2Both these equations are not the same and hence does not give the same value.