Rutherford and Bohr models, hydrogen spectrum, nuclear binding energy, radioactivity and decay laws.
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Q1 · Bohr Atom and Spectra · HARD
In Bohr's model of hydrogen atom, an electron transitions from n = 4 to n = 2 state. If the energy of the photon emitted is E, what will be the energy of the photon emitted when the electron transitions from n = 2 to n = 1?
Q2 · Nuclei and Radioactivity · MEDIUM
A radioactive nucleus undergoes a series of decays: it first emits an alpha particle, then a beta particle, and finally another alpha particle. If the original atomic number was Z and mass number was A, what are the atomic number and mass number of the final nucleus?
Q3 · Bohr Atom and Spectra · MEDIUM
An electron in a hydrogen atom makes a transition from n = 4 to n = 2 energy level. What is the wavelength of the photon emitted? (Rydberg constant R = 1.097 × 10⁷ m⁻¹)
Q4 · Bohr Atom and Spectra · HARD
In the Bohr model of hydrogen atom, an electron transitions from n = 4 to n = 2 energy level. If the energy of the photon emitted in a transition from n = 2 to n = 1 is E₀, what is the energy of the photon emitted in the n = 4 to n = 2 transition?
Q5 · Nuclei and Radioactivity · EASY
A radioactive nucleus has a half-life of 10 days. What fraction of the original sample will decay in 30 days?