An unknown nucleus has a nuclear density of 2.29 1017 kg/m3 and mass of 19.926 10-27 kg. Its mass number A is approximately : (Take R0 = 1.2 10-15 m, 4π = 12.56)
(3) 12
M = 43 R3 and R3 = R03A
A = 3M4 R03
A = 3 19.926 10-2712.56 (1.2 10-15)3 2.29 1017
A = 5.978 10-2612.56 1.728 10-45 2.29 1017
A = 5.978 10-264.970 10-27
A 12
Answer: (3)
Consider the following nuclear reaction 238U 234Th + 4He Take masses of 238U, 234Th and 4He as 238.050 u, 234.043 u and 4.003 u, respectively. The Q value for the reaction, in keV, is: [Given: 1 u = 931.5 MeV c-2]
29082X Y e+ Z - P e- Q In the nuclear emission stated above, the mass number and atomic number of the product Q respectively, are
Water is used as a coolant in a nuclear reactor because of its
Select the correct statements among the following : Choose the most appropriate answer from the options given below :
The half life of a radioactive substance is 20 minutes. In how much time, the activity of substance drops to ( 116 )th of its initial value?
A nucleus of mass number 189 splits into two nuclei having mass number 125 and 64. The ratio of radius of two daughter nuclei respectively is
In the given nuclear reaction, the element X is 2211Na X + e+ +
Given below are two statements In the light of the above statements, choose the most appropriate answer from the options given below :
At any instant, two elements X1 and X2 have same number of radioactive atoms. If the decay constant of X1 and X2 are 10 and respectively, then the time when the ratio of their atoms becomes 1e respectively will be :
A nucleus with mass number 240 breaks into two fragments each of mass number 120, the binding energy per nucleon of unfragmented nuclei is 7.6 MeV while that of fragments is 8.5 MeV. The total gain in the Binding Energy in the process is :