NEET 2022 PHASE 2
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Given below are two statements
Statement I : The law of radioactive decay states that the number of nuclei undergoing the decay per unit time is inversely proportional to the total number of nuclei in the sample.
Statement II : The half of a radionuclide is the sum of the life time of all nuclei, divided by the initial concentration of the nuclei at time t = 0.
In the light of the above statements, choose the most appropriate answer from the options given below :
Match List-I with List-II :
| List-I (Defects) |
List-II (Shown by) |
||
|---|---|---|---|
| (a) | Frenkel defect | (i) | Non-ionic solids and density of the solid decreases |
| (b) | Schottky defect | (ii) | Non-ionic solids and density of the solid increases |
| (c) | Vacancy defect | (iii) | Ionic solids and density of the solid decreases |
| (d) | Interstitial defect | (iv) | Ionic solids and density of the solid remains constant |
Choose the correct answer from the options given below :
The ascent of xylem sap is plants in mainly accomplished by the
At any instant, two elements X1 and X2 have same number of radioactive atoms. If the decay constant of X1 and X2 are 10 \(\lambda\) and \(\lambda\) respectively, then the time when the ratio of their atoms becomes \({1 \over e}\) respectively will be :
The element used for welding metals with high melting points is
Which of the following protects nitrogenase inside the root nodule of a leguminous plant?