MHT CET 2024 3rd May Morning Shift | Atoms and Nuclei Question 27 | Physics

In the uranium radioactive series, the initial nucleus is ${ }_{92}^{238} \mathrm{U}$ and that the final nucleus is ${ }_{82}^{206} \mathrm{~Pb}$. When uranium nucleus decays into lead, the number of $\alpha$-particles and $\beta$-particles emitted are

$4 \alpha, 5 \beta$

$5 \alpha, 3 \beta$

$6 \alpha, 7 \beta$

$8 \alpha, 6 \beta$

MHT CET 2024 3rd May Morning Shift

MCQ (Single Correct Answer)

-0

If ' $\lambda_1$ ' and ' $\lambda_2$ ' are the wavelengths of the first line of the Lyman and Paschen series respectively, then $\lambda_2: \lambda_1$ is

$3: 1$

$30: 1$

$50: 7$

$108: 7$

MHT CET 2024 2nd May Evening Shift

MCQ (Single Correct Answer)

-0

An electron of stationary Hydrogen atom passes from fifth energy level to ground level. The velocity that the atom acquired as a result of photo emission is

( $\mathrm{m}=$ mass of electron, $\mathrm{R}=$ Rydberg's constant)

( $\mathrm{h}=$ Planck's constant)

$\frac{24 \mathrm{Rh}}{25 \mathrm{~m}}$

$\frac{25 \mathrm{Rh}}{24 \mathrm{~m}}$

$\frac{25 \mathrm{~m}}{24 \mathrm{Rh}}$

$\frac{24 \mathrm{~m}}{25 \mathrm{Rh}}$

MHT CET 2024 2nd May Evening Shift

MCQ (Single Correct Answer)

-0

Which of the following statements about the Bohr model of the hydrogen atom is false?

Acceleration of electron in $\mathrm{n}=2$ orbit is less than that in $n=1$ orbit.

Angular momentum of electron in $\mathrm{n}=2$ orbit is more than that in $n=1$ orbit.

Kinetic energy of electron in $\mathrm{n}=2$ orbit is less than that in $\mathrm{n}=1$ orbit.

Potential energy of electron in $\mathrm{n}=2$ orbit is less than that in $n=1$ orbit.

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