EASY
JEE Main
IMPORTANT
Earn 100

The mass of proton, neutron and helium nucleus are respectively 1.0073 u, 1.0087 u and 4.0015u. The binding energy of helium nucleus is:

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Important Questions on Atoms and Nuclei

MEDIUM
JEE Main
IMPORTANT
A light of energy 12.75 eV is incident on a hydrogen atom in its ground state. The atom absorbs the radiation and reaches to one of its excited states. The angular momentum of the atom in the excited state is xπ×10-17 eVs. The value of x is ______ (use h=4.14×1015 eVs, c=3 ×108 m s1)
EASY
JEE Main
IMPORTANT

An electron of a hydrogen like atom, having Z = 4, jumps from 4th energy state to 2nd energy state, The energy released in this process, will be: (Given Rch = 13.6 eV)

Where R = Rydberg

constant c = Speed of light in vacuum

h = Planck's constant

MEDIUM
JEE Main
IMPORTANT
Nucleus A having Z=17 and equal number of protons and neutrons has 1.2 MeV binding energy per nucleon. Another nucleus B of Z=12 has total 26 nucleons and 1.8 MeV binding energy per nucleons. The difference of binding energy of B and A will be ______ MeV.