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#1 Class 12 Physics Atoms 2021 Short 2M CBSE

How does the impact parameter affect the trajectory of $\alpha$-particles scattered by a heavy nucleus? What is the value of impact parameter for head-on collision?

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#2 Class 12 Physics Atoms 2022 Short 5M CBSE

The value of ground state energy of hydrogen atom is $-13.6$ eV. Find the energy required to move an electron from ground state to first excited state. Determine (a) the kinetic energy and (b) the orbital radius in th...

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#3 Class 12 Physics Atoms 2023 Short 5M CBSE

A 12.5 eV electron beam is used to bombard gaseous hydrogen at room temperature. Up to which energy level would the hydrogen atoms be excited? Calculate the wavelengths of (a) the first member of Lyman series and (b) ...

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#4 Class 12 Physics Atoms 2020 Short 2M CBSE

Calculate the wavelength of radiation emitted when an electron in a hydrogen atom jumps from $n = 3$ to $n = \infty$.

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#5 Class 12 Physics Atoms 2022 Short 3M CBSE

In an experiment of $\alpha$-particle scattering by a thin gold foil, draw a plot showing the number of particles scattered versus the scattering angle $\theta$. Why is a very small fraction of particles scattered at ...

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#6 Class 12 Physics Atoms 2021 Short 3M CBSE

State the drawbacks of Bohr's atomic theory.

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#7 Class 12 Physics Atoms 2023 Long 5M CBSE

Describe Rutherford's model of the atom. Give its limitations.

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#8 Class 12 Physics Atoms 2022 Short 2M CBSE

In the Rutherford scattering experiment, the distance of closest approach for an $\alpha$-particle is $d_0$. If the $\alpha$-particle is replaced by a proton, how much energy (in comparison to the $\alpha$-particle) w...

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#9 Class 12 Physics Atoms 2011 Short 1M CBSE

State Bohr's quantisation condition for defining stationary orbits.

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#10 Class 12 Physics Atoms 2022 Short 2M CBSE

Consider two different hydrogen atoms. The electron in each atom is in an excited state. Is it possible for the electrons to have different energies but the same orbital angular momentum according to the Bohr model?

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#11 Class 12 Physics Atoms 2021 Short 2M CBSE

Where is the $H_\alpha$ line of the Balmer series in the emission spectrum of the hydrogen atom obtained?

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#12 Class 12 Physics Atoms 2020 Short 1M CBSE

Define ionisation energy. What is its value for a hydrogen atom?

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#13 Class 12 Physics Atoms 2019 Short 1M CBSE

What is the ratio of the radii of the orbits corresponding to the first excited state and ground state in a hydrogen atom?

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#14 Class 12 Physics Atoms 2021 Mcq 1M CBSE

The radius of the innermost electron orbit of a hydrogen atom is $5.3 \times 10^{-11}$ m. The radius of the $n = 3$ orbit is

A. $1.01 \times 10^{-10}$ m

B. $1.59 \times 10^{-10}$ m

C. $2.12 \times 10^{-10}$ m

D. $4.77 \times 10^{-10}$ m

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#15 Class 12 Physics Atoms 2020 Mcq 1M CBSE

The energy of an electron in the $n$th orbit of hydrogen atom is $E_n = -13.6/n^2$ eV. The negative sign of energy indicates that

A. electron is free to move

B. electron is bound to the nucleus

C. kinetic energy equals potential energy

D. atom is radiating energy

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#16 Class 12 Physics Atoms 2022 Long 1M CBSE

Assertion (A): In a hydrogen atom there is only one electron but its emission spectrum shows many lines. Reason (R): In a given sample of hydrogen there are many atoms each containing one electron; electrons in differ...

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#17 Class 12 Physics Atoms 2021 Mcq 1M CBSE

Which of the following transitions in hydrogen atom corresponds to emission of radiation of maximum wavelength?

A. $n = 2 \to n = 1$

B. $n = 3 \to n = 2$

C. $n = 4 \to n = 3$

D. $n = 5 \to n = 4$

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#18 Class 12 Physics Atoms 2020 Mcq 1M CBSE

The ground state energy of hydrogen atom is $-13.6$ eV. What is the potential energy of the electron in this state?

A. 0 eV

B. 1 eV

C. 2 eV

D. $-27.2$ eV

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#19 Class 12 Physics Atoms 2019 Mcq 1M CBSE

If the energy of hydrogen atom in ground state is $-13.6$ eV, then its energy in the first excited state will be

A. $-3.4$ eV

B. $-6.8$ eV

C. $-27.2$ eV

D. $-52.4$ eV

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#20 Class 12 Physics Atoms 2022 Short 2M CBSE

What is the energy level (principal quantum number) of the orbit in a triply ionized beryllium ion ($\text{Be}^{3+}$) that has the same radius as the ground state ($n = 1$) orbit of a hydrogen atom?

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