Atoms and Nuclei

Numerical 08

08. A nucleus of UX₁ has a half life of 24.1 days. How long a sample of UX₁ will take to change 90% of it to UX₂?

Suggested solution:

Decay constant,

Taking logs, we get lt = log_e10 = 2.3

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	Introduction
	Thomson's Model
	Rutherford's Experiment
	The Electric Potential Energy
	Rutherford's Atom Model (Main Features)
	Bohr's Theory of Hydrogen Atom
	Excitation and Ionisation Potential
	Emission and Absorption Spectra
	Moseley's Law
	Atomic Number
	Spontaneous and Stimulated Radiation
	Atomic Nucleus
	Relation Between Atomic Mass Unit and MeV (Mass Energy Relation)
	Isotopes, Isobars and Isotones
	Mass Energy Relation
	Binding Energy and Mass Defect
	Binding Energy
	Nature of Nuclear Forces
	Radioactivity
	Laws of Radioactive Disintegration
	Nuclear Fission
	Nuclear Reactor
	Nuclear Fusion
	Summary
	Conclusion
	Numerical -1
	Numerical -2
	Numerical -3
	Numerical -4
	Numerical -5
	Numerical -6
	Numerical -7
	Numerical -8
	Numerical -9
	Numerical -10
	Numerical -11
	Numerical -12
Animations
	Rutherford's Experiment
	X-Rays
	Laser
	Ruby Laser
	Atomic nucleus
	Discovery of Neutrons
	Nuclear Reactions
	Nuclear Reactor

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