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Atoms and Nuclei (Class 12)
Rutherford and Bohr models, hydrogen spectrum, mass defect, fission, fusion, decay laws.
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Take a full mock →Q1 · Atoms and Nuclei (Class 12) · EASY
In Rutherford's nuclear model of the atom, an electron revolves around the nucleus in a circular orbit. If the radius of the orbit is doubled while keeping the charge on the nucleus and the electron unchanged, what happens to the electrostatic force between the nucleus and the electron?
Q2 · Atoms and Nuclei (Class 12) · MEDIUM
The first line of the Balmer series in the hydrogen spectrum has a wavelength of 656 nm. An electron transition from which orbit to n = 2 produces this line?
Q3 · Atoms and Nuclei (Class 12) · MEDIUM
A radioactive nucleus X undergoes a series of decays: X -> Y + alpha particle, then Y -> Z + beta particle. If the atomic number of X is 92 and its mass number is 238, what are the atomic number and mass number of Z respectively?
Q4 · Atoms and Nuclei (Class 12) · MEDIUM
A radioactive element X undergoes decay with a half-life of 4 days. If initially there are 8 × 10²⁰ atoms, how many atoms of X will remain after 12 days?
Q5 · Atoms and Nuclei (Class 12) · HARD
In a hydrogen atom, an electron transitions from the fourth orbit to the second orbit. If the Rydberg constant is R = 1.097 × 10⁷ m⁻¹, the wavelength of the emitted photon (in nm) is approximately: