Q}: Singular solution. An ODE may sometimes have an -""'" additional solution that cannot be obtained from the general solution and is then called a singular solution. The ODE y'z 501' + y = 0 is of this kind. Show by differentiation and substitution that it has the general solution y = C): c2 and the singular solution y = X2/4. Explain Fig. 6. Fig. 6. Particular solutions and singular solution in Problem 16 @134 Half-life. Radium 233% has a half-life of about I 3.6 days. (a) Given 1 gram, how much will still be present after 1 day? (b) After 1 year