Atoms and Nuclei
Bohr's model, hydrogen spectrum, nuclear binding energy, radioactivity, fission, fusion.
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Take a full mock →Q1 · Atoms and Nuclei · EASY
In Bohr's model, the radius of the nth orbit in a hydrogen atom is r_n = n² r_0 (where r_0 is the Bohr radius). For n = 3, the orbital radius is:
Q2 · Atoms and Nuclei · EASY
A radioactive sample has a half-life of 10 days. The fraction of the original sample remaining after 30 days is:
Q3 · Atoms and Nuclei · HARD
A nucleus X undergoes alpha decay followed by two beta-minus decays to form nucleus Y. If the atomic number and mass number of X are Z and A respectively, then the atomic number and mass number of Y are:
Q4 · Atoms and Nuclei · MEDIUM
The half-life of a radioactive substance is 40 days. The time taken for 75% of the sample to decay is:
Q5 · Atoms and Nuclei · EASY
In the Bohr model of hydrogen atom, the energy of an electron in the nth orbit is given by Eₙ = −13.6/n² eV. The energy required to excite an electron from n = 2 to n = 4 is: