Q1. What is the wavelength of light emitted when an electron transitions from n=3 to n=1 in a hydrogen atom? (2020)
Solution:
Using the Rydberg formula, the wavelength for the transition from n=3 to n=1 can be calculated to be approximately 102.6 nm.
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Q2. Which of the following describes the concept of quantization in atomic physics? (2023)
Solution:
Quantization means that energy levels in an atom are discrete, not continuous.
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Q3. Which of the following transitions in a hydrogen atom will emit the highest energy photon? (2019)
Solution:
The energy of the emitted photon is highest for the transition from n=2 to n=1, as it involves the largest difference in energy levels.
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Q4. What is the ionization energy of hydrogen in eV? (2019)
Solution:
The ionization energy of hydrogen is 13.6 eV, which is the energy required to remove the electron from the ground state.
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Q5. Which particle is responsible for the chemical properties of an atom? (2023)
Solution:
Electrons, particularly those in the outer shell, determine the chemical properties of an atom.
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Q6. What is the ground state electron configuration of an oxygen atom? (2023)
Solution:
Oxygen has 8 electrons, and its ground state electron configuration is 1s² 2s² 2p⁴.
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Q7. What is the main reason for the stability of the electron orbits in an atom according to the Bohr model? (2019)
Solution:
In the Bohr model, electrons occupy quantized energy levels, which leads to stable orbits around the nucleus.
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Q8. What is the principal quantum number for an electron in the third energy level? (2019)
Solution:
The principal quantum number (n) indicates the energy level; for the third energy level, n = 3.
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Q9. In the photoelectric effect, what happens to the kinetic energy of emitted electrons when the frequency of incident light is increased? (2021)
Solution:
According to the photoelectric effect, the kinetic energy of emitted electrons increases with the frequency of the incident light, provided the frequency is above the threshold frequency.
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Q10. What is the maximum number of electrons that can occupy the n=3 energy level in an atom? (2021)
Solution:
The maximum number of electrons in an energy level is given by the formula 2n². For n=3, it is 2(3)² = 18.
