1
MHT CET 2021 20th September Evening Shift
MCQ (Single Correct Answer)
+1
-0

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

A
$$7.5 \times 10^{16}$$
B
$$2.0 \times 10^{16}$$
C
$$0.5 \times 10^{16}$$
D
$$4.0 \times 10^{16}$$
2
MHT CET 2021 20th September Evening Shift
MCQ (Single Correct Answer)
+1
-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 54 English

A
$$\sqrt{\frac{n^2}{n-1}}$$
B
$$\sqrt{\frac{n-1}{n}}$$
C
$$\sqrt{\frac{\mathrm{n}}{\mathrm{n}-1}}$$
D
$$\sqrt{\frac{\mathrm{n}(\mathrm{n}-1)}{\mathrm{n}}}$$
3
MHT CET 2021 20th September Evening Shift
MCQ (Single Correct Answer)
+1
-0

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

A
decreases with the quantum number 'n'.
B
independent of which orbit it is in.
C
negative
D
positive
4
MHT CET 2021 20th September Morning Shift
MCQ (Single Correct Answer)
+1
-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

A
3
B
4
C
5
D
6
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