Atoms And Nuclei Mock Tests

In a hydrogen atom, an electron transitions from the n = 4 energy level to the n = 2 energy level. The wavelength of the emitted photon is in the: (Rydberg constant R = 1.097 × 10⁷ m⁻¹)

The Lyman series of hydrogen spectrum lies in the:

The radius of the first Bohr orbit of hydrogen is 0.53 Å. The radius of the nth orbit is:

In a nuclear fusion reaction, two deuterium nuclei (²H) fuse to form a helium-4 nucleus (⁴He). If the binding energy per nucleon of deuterium is 1.1 MeV and that of helium-4 is 7.0 MeV, the energy released is:

A radioactive substance has half-life 5 years. After 15 years, the fraction of original nuclei remaining is:

A nuclear reactor is said to be critical when:

The energy equivalent of 1 kg mass is: (c = 3 × 10⁸ m/s)

In the Bohr model of hydrogen atom, the electron revolves in an orbit of radius r with speed v. The angular momentum of the electron is: