MHT CET 2021 20th September Evening Shift | Atoms and Nuclei Question 35 | Physics

A sample of radioactive element contains $$8 \times 10^{16}$$ active nuclei. The halt-life of the element is 15 days. The number of nuclei decayed after 60 days is

$$7.5 \times 10^{16}$$

$$2.0 \times 10^{16}$$

$$0.5 \times 10^{16}$$

$$4.0 \times 10^{16}$$

MHT CET 2021 20th September Evening Shift

MCQ (Single Correct Answer)

-0

The P.E. 'U' of a moving particle of mass 'm' varies with 'x'-axis as shown in figure. The deBroglie wavelength or the particle in the regions $$0 \leq x \leq 1$$ and $$x > 1$$ are $$\lambda_1$$ and $$\lambda_2$$ respectively. II the total energy of the particle is '$$\mathrm{nE}$$', then the ratio $$\lambda_1 / \lambda_2$$ is

MHT CET 2021 20th September Evening Shift Physics - Atoms and Nuclei Question 38 English

$$\sqrt{\frac{n^2}{n-1}}$$

$$\sqrt{\frac{n-1}{n}}$$

$$\sqrt{\frac{\mathrm{n}}{\mathrm{n}-1}}$$

$$\sqrt{\frac{\mathrm{n}(\mathrm{n}-1)}{\mathrm{n}}}$$

MHT CET 2021 20th September Evening Shift

MCQ (Single Correct Answer)

-0

The gyromagnetic ratio of an electron in an hydrogen atom, according to Bohr model is

decreases with the quantum number 'n'.

independent of which orbit it is in.

negative

positive

MHT CET 2021 20th September Morning Shift

MCQ (Single Correct Answer)

-0

The electron in hydrogen atom is initially in the third excited state. When it finally moves to ground state, the maximum number of spectral lines emitted are

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