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#1 Class 12 Physics Atoms 2011 Short 1M

State Bohr's quantisation condition for defining stationary orbits.

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#2 Class 12 Physics Atoms 2022 Short 2M

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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#3 Class 12 Physics Atoms 2021 Short 2M

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

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#4 Class 12 Physics Atoms 2020 Short 1M

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

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#5 Class 12 Physics Atoms 2019 Short 1M

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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#6 Class 12 Physics Atoms 2021 Mcq 1M

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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#7 Class 12 Physics Atoms 2020 Mcq 1M

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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#8 Class 12 Physics Atoms 2022 Long 1M

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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#9 Class 12 Physics Atoms 2021 Mcq 1M

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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#10 Class 12 Physics Atoms 2020 Mcq 1M

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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#11 Class 12 Physics Atoms 2019 Mcq 1M

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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#12 Class 12 Physics Atoms 2022 Short 2M

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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#13 Class 12 Physics Atoms 2020 Mcq 1M

The hydrogen atom can give spectral lines in the Lyman, Balmer and Paschen series. Which of the following statements is correct?

A. Balmer series is in the visible region

B. Paschen series is in the visible region

C. Lyman series is in the infrared region

D. Balmer series is in the ultraviolet region

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#14 Class 12 Physics Atoms 2019 Mcq 1M

According to Rutherford's atomic model, the electrons inside the atom are

A. stationary

B. not stationary (revolving)

C. centralized

D. none of these

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#15 Class 12 Physics Atoms 2007 Mcq 1M

Rutherford's $\alpha$-particle experiment showed that atoms have

A. proton

B. nucleus

C. neutron

D. electrons

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#16 Class 12 Physics Atoms 2013 Mcq 1M

Which series comes in the visible region of the hydrogen spectrum?

A. Lyman series

B. Balmer series

C. Paschen series

D. Brackett series

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#17 Class 12 Physics Atoms 2020 Short 1M

What is the minimum angular momentum of an electron in the hydrogen atom?

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#18 Class 12 Physics Atoms 2021 Short 2M

A hydrogen atom makes a transition from $n = 5$ to $n = 1$ orbit and emits a photon of wavelength $\lambda$. What is the wavelength of the photon emitted when it makes a transition from $n = 5$ to $n = 2$ orbit?

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#19 Class 12 Physics Dual Nature of Radiation and Matter 2022 Short 2M

Photons of energy 6 eV are incident on cathode C in a photoelectric cell. The maximum energy of emitted photoelectrons is 2 eV. When photons of energy 5 eV are incident on C, no photoelectrons will reach anode A. Find...

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#20 Class 12 Physics Dual Nature of Radiation and Matter 2021 Short 2M

When a photon of energy 5 eV falls on a metallic surface of work function 3 eV, find the kinetic energy of emitted electrons.

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