Atoms - ISC Class 12 Physics Questions with Answers
31 past-paper questions on Atoms from ISC Class 12 Physics papers (2027-2018), newest first. Open one to see its answer.
- Answer the following questions: Write Bohr’s equations for circular motion of an electron around the nucleus and conservation of… 2027 · 5 marks · Long answer
- State any one postulate of Bohr’s theory of hydrogen atom. 2026 · 1 mark · Short answer
- Answer the following questions: In an atom X, electrons absorb the energy from an external source. This energy “excites” the… 2026 · 5 marks · Numerical
- Radius of the first Bohr orbit of hydrogen atom is 0.05nm. Calculate the radius of the third orbit. 2026 · 1 mark · Numerical
- A 9.2 eV electron beam is used to bombard gaseous hydrogen at room temperature. What series of wavelengths will be emitted if any? 2025 · 1 mark · Short answer
- Calculate the wavelength of a photon needed to ionize a hydrogen atom. 2025 · 1 mark · Numerical
- If radius of first Bohr orbit of an electron in hydrogen atom is $0.05\text{ nm}$, calculate the radius of its third orbit. 2025 · 1 mark · Numerical
- State Bohr’s postulate of quantisation of angular momentum. Show how it can be obtained from wave nature of orbiting electrons… 2025 · 5 marks · Short answer
- Define unified atomic mass unit. Calculate its energy equivalent. In an atom X, electrons absorb the energy from an external… 2025 · 5 marks · Numerical
- The energy of an electron in the ground state of a hydrogen atom is $-13.6\text{ eV}$. What will be the ratios of energies in the… 2025 · 1 mark · MCQ
- Draw a graph showing the variation of binding energy (in eV) versus the first five principal quantum numbers in a hydrogen atom. 2025 · 2 marks · Drawing
- The kinetic energy of an $\alpha$-particle incident on a gold foil is doubled. How does the distance of the closest approach… 2025 · 1 mark · Short answer
- The wave nature of matter is what prevents atoms from collapsing and gives atoms their sizes. 2025 · 1 mark · Assertion-reason
- Show that radius ($r_n$) of the $n^{\text{th}}$ Bohr orbit varies directly with square of the principal quantum number ($n$) of… 2025 · 5 marks · Short answer
- The Lyman series spectrum of an atom contains wavelengths of 176.7 nm and 137.5 nm. The energy of the ground level of the atom is… 2025 · 3 marks · Numerical
- Answer the following questions: Calculate the angular momentum of a ‘$\gamma$’ photon which is emitted when an electron jumps… 2025 · 3 marks · Long answer
- Which of the following is NOT a limitation of Bohr’s theory? 2025 · 1 mark · MCQ
- Figure 1 below is the Energy level diagram for Hydrogen atom. Study the transitions shown and answer the following questions… 2024 · 2 marks · Short answer
- On the basis of Bohr’s theory, derive an expression for the radius of the $n^{\text{th}}$ orbit of an electron of hydrogen atom… 2024 · 5 marks · Derivation
- Name the series of lines of hydrogen spectrum which lies in the (1) ultraviolet region. (2) visible region. How much is the… 2023 · 5 marks · Short answer
- Using Bohr’s Theory of hydrogen atom, obtain an expression for the velocity of an electron in $n^{\text{th}}$ orbit of an atom… 2023 · 5 marks · Derivation
- State the postulate of Bohr’s theory regarding: (1) Quantisation of angular momentum of an electron. (2) Emission of energy by an… 2023 · 5 marks · Short answer
- Using Bohr’s theory of hydrogen atom, obtain an expression for the radius of the $n^{\text{th}}$ orbit of an electron in an atom… 2023 · 5 marks · Long answer
- First line of Balmer series ($H_\alpha$) in the spectrum of hydrogen is obtained when an electron of hydrogen atom goes from: 2022 · 1 mark · MCQ
- On the basis of Bohr’s theory, derive an expression for the radius of the nth orbit of an electron of hydrogen atom. 2022 · 3 marks · Derivation
- Draw the energy level diagram of hydrogen atom and show the transitions responsible for: absorption lines of Lyman series… 2020 · 3 marks · Drawing
- Name the series in the atomic spectra of the hydrogen atom that falls in the ultra violet region. 2019 · 1 mark · One word
- State any two Bohr’s postulates and write the energy value of the ground state of the hydrogen atom. 2019 · 3 marks · Short answer
- Calculate the minimum wavelength of the spectral line present in Balmer series of hydrogen. 2018 · 2 marks · Numerical
- Draw energy level diagram for Hydrogen atom showing at least four lowest energy levels. Show the transitions responsible for… 2018 · 2 marks · Drawing
- In Bohr's model of hydrogen atom, radius of the first orbit of an electron is $r_0$. Then, radius of the third orbit is: 2018 · 1 mark · MCQ
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