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#1 Class 12 Physics Nuclei 2019 Short 1M

For a uranium nucleus, how does its mass vary with volume?

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#2 Class 12 Physics Nuclei 2020 Mcq 1M

Which of the following is an essential requirement for initiating a fusion reaction?

A. critical mass

B. thermal neutrons

C. high temperature

D. critical temperature

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#3 Class 12 Physics Nuclei 2018 Mcq 1M

Elements with the same atomic mass but different atomic number are called

A. isobars

B. isotones

C. isotopes

D. isochores

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#4 Class 12 Physics Nuclei 2019 Mcq 1M

Isotopes have

A. same atomic number and mass number

B. same mass number but different atomic number

C. different atomic number and mass number

D. same atomic number but different mass number

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#5 Class 12 Physics Nuclei 2020 Mcq 1M

As mass number $A$ increases, which of the following quantities related to a nucleus does NOT change?

A. Mass

B. Volume

C. Density

D. Binding energy

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#6 Class 12 Physics Atoms 2023 Long 5M

Write the three postulates of Bohr's model of the hydrogen atom. Show that, in this model, the frequency of revolution of an electron in its $n$th orbit is proportional to $(1/n^3)$.

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#7 Class 12 Physics Atoms 2021 Mcq 1M

In a Rutherford scattering experiment, when an $\alpha$-particle of mass $m_1$ approaches a target nucleus of charge $Ze$ and mass $m_2$, the distance of closest approach is $d_0$. The energy of the particle is

A. directly proportional to $Z$

B. inversely proportional to $Z$

C. directly proportional to $m_2$

D. directly proportional to $m_1 m_2$

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#8 Class 12 Physics Atoms 2022 Short 3M

In the spectrum of hydrogen, find the ratio of the longest wavelength in the Lyman series to the longest wavelength in the Balmer series.

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#9 Class 12 Physics Atoms 2019 Short 1M

As the number of orbit $n$ increases, what happens to the difference of energy between consecutive energy levels?

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#10 Class 12 Physics Atoms 2020 Short 1M

Find the speed of an electron in the 4th orbit of a hydrogen atom.

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#11 Class 12 Physics Atoms 2021 Short 2M

The short wavelength limit for the Lyman series of the hydrogen spectrum is 913.4 Å. Calculate the short wavelength limit for the Balmer series.

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#12 Class 12 Physics Atoms 2021 Short 3M

The total energy of an electron in the first excited state of the hydrogen atom is about $-3.4$ eV. (a) What is the kinetic energy of the electron in this state? (b) What is the potential energy of the electron in thi...

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#13 Class 12 Physics Atoms 2021 Short 2M

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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#14 Class 12 Physics Atoms 2022 Short 5M

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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#15 Class 12 Physics Atoms 2023 Short 5M

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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#16 Class 12 Physics Atoms 2020 Short 2M

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

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#17 Class 12 Physics Atoms 2022 Short 3M

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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#18 Class 12 Physics Atoms 2021 Short 3M

State the drawbacks of Bohr's atomic theory.

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#19 Class 12 Physics Atoms 2023 Long 5M

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

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#20 Class 12 Physics Atoms 2022 Short 2M

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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