Q1. What is the main component of a nuclear reactor that slows down neutrons? (2023)
Solution:
The moderator is the main component in a nuclear reactor that slows down neutrons to sustain the nuclear chain reaction.
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Q2. What is the principal quantum number of an electron in the third energy level? (2023)
Solution:
The principal quantum number (n) indicates the energy level. For the third energy level, n = 3.
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Q3. What is the minimum energy required to remove an electron from the surface of a metal with a work function of 2.5 eV? (2023)
Solution:
The minimum energy required to remove an electron is equal to the work function of the metal, which is 2.5 eV.
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Q4. If the wavelength of light is halved, what happens to its frequency? (2021)
Solution:
Frequency (f) is inversely proportional to wavelength (λ). If λ is halved, f is doubled.
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Q5. What is the principal quantum number of an electron in the ground state of a hydrogen atom? (2022)
Solution:
The ground state of hydrogen corresponds to n = 1.
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Q6. Which of the following statements is true regarding the uncertainty principle? (2023)
Solution:
The uncertainty principle states that position and momentum cannot be precisely known at the same time.
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Q7. What is the energy of a photon emitted when an electron transitions from n=3 to n=2 in a hydrogen atom? (Rydberg constant R = 1.097 x 10^7 m^-1) (2021)
Solution:
Energy = 13.6 eV * (1/n1^2 - 1/n2^2) = 13.6 * (1/2^2 - 1/3^2) = 3.40 eV.
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Q8. What is the significance of the Rydberg constant? (2022)
Solution:
The Rydberg constant is used to calculate the wavelengths of spectral lines in hydrogen and other hydrogen-like atoms.
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Q9. What is the significance of the wave function in quantum mechanics? (2023)
Solution:
The wave function provides the probability distribution of a particle's position.
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Q10. If the wavelength of light is halved, what happens to the energy of the photons? (2020)
Solution:
Energy is inversely proportional to wavelength. Halving the wavelength doubles the energy.
