Nuclei Flashcards
1 amu = ?
1.6 x 10 ^-27 kg
What are isotopes
Atomic species of same element different in mass are called isotopes
Who discovered Neutron
James Chadwick
How did chadwick discovered neutrons
He bombarded nucleus of beryllium with alpha particles. He observed neutral radiation from the nucleus which could knock out protons from light nucleus.
What is mass of neutron
1.6 x 10^-27 kg
What is the distance of closest approach to a gold nucleus
4 x 10 ^-14 m
What is radius of nucleus having mass number A
R = Ro x A^1/3
What is value of Ro
1.2 x 10 -15 m or 1.2 fm
What is density of nucleur matter
2.3 x 10^17 kg/m^3
Define mass defect
The difference in mass of a nucleus and its constituents is mass defect
Write formula to find mass defect
M = (Zm x (A-Z)x m) - M
What is binding energy
If a certain no. of neutron and protons are brought together to form a nucleus an energy E will be released.
This energy is binding energy of the nucleus
Define binding energy per nucleon
Binding energy per nucleon in the average energy per nucleon needed to separate a nucleus into its individual nucleon
What is saturation property of the nuclear force
The property that a given nucleon influences only nucleon close to it also referred to as saturation property of the nuclear force
How can we say that nuclear force is stronger than coulomb’s force
The nuclear force is stronger than coulomb’s force because nuclear binding force has to dominate over the coulomb’s repulsive force b/w protons inside the nucleus
