Atomic Structure and Radioactivity - SS1 Physics Past Questions and Answers - page 4
Discuss the limitations of the Bohr Model and the development of Quantum Mechanics.
The Bohr Model of the atom has certain limitations. It does not account for the wave-particle duality of electrons and cannot explain phenomena like electron diffraction and the uncertainty principle. To overcome these limitations, the development of Quantum Mechanics was necessary. Quantum Mechanics, based on the principles of wave-particle duality, treats electrons as waves of probability. It describes the behaviour of electrons using mathematical equations, such as the Schrödinger equation, which provides information about the electron's position, energy, and orbital shapes. Quantum Mechanics provides a more accurate and comprehensive understanding of atomic structure and electron behaviour.
Radioactivity is the spontaneous emission of:
Electrons
Protons
Alpha particles
Neutrons
The process in which an unstable atomic nucleus emits an alpha particle is known as:
Alpha decay
Beta decay
Gamma decay
Nuclear fission
The half-life of a radioactive substance is defined as the time it takes for:
Half of the substance to decay
All of the substance to decay
One-fourth of the substance to decay
None of the above
Beta decay involves the emission of:
Protons
Electrons
Neutrons
Alpha particles
Gamma radiation is:
A stream of protons
A stream of electrons
High-energy electromagnetic radiation
The emission of alpha particles
The process in which a heavy nucleus splits into two smaller nuclei is called:
Alpha decay
Beta decay
Gamma decay
Nuclear fission
The decay of a radioactive substance follows a:
Linear pattern
Exponential pattern
Logarithmic pattern
Random pattern
Radioactive isotopes are used in:
Medical imaging
Power generation
Carbon dating
All of the above
The unit used to measure the amount of radioactivity is:
Watt
Coulomb
Becquerel
Ampere