JEE Main 2023 (Online) 11th April Evening Shift | Atoms and Nuclei Question 48 | Physics

Two radioactive elements A and B initially have same number of atoms. The half life of A is same as the average life of B. If $$\lambda_{A}$$ and $$\lambda_{B}$$ are decay constants of A and B respectively, then choose the correct relation from the given options.

$$\lambda_{\mathrm{A}}=\lambda_{\mathrm{B}} \ln 2$$

$$\lambda_{\mathrm{A}} \ln 2=\lambda_{\mathrm{B}}$$

$$\lambda_{\mathrm{A}}=2 \lambda_{\mathrm{B}}$$

$$\lambda_{\mathrm{A}}=\lambda_{\mathrm{B}}$$

JEE Main 2023 (Online) 10th April Evening Shift

MCQ (Single Correct Answer)

-1

Out of Syllabus

The half life of a radioactive substance is T. The time taken, for disintegrating $$\frac{7}{8}$$th part of its original mass will be:

JEE Main 2023 (Online) 10th April Morning Shift

MCQ (Single Correct Answer)

-1

The angular momentum for the electron in Bohr's orbit is L. If the electron is assumed to revolve in second orbit of hydrogen atom, then the change in angular momentum will be

$$\frac{L}{2}$$

zero

2 L

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