Chapter 30 : Nuclear Physics

Atomic number Z, of an atom is the number of protons. (Nuclear charge= Ze Atomic Mass Unit 1.66 X 10^-27 Kg (u) Mass number (A) number of neutrons and protons. Nuclear mass= A (u) Nuclide nucleus of an isotope. Strong nuclear force also called strong force, acts between protons and Read more…

Nuclear Physics

Absorber Material that prevent radioactive emission from passing through it. ? Activity Number of radioactive emissions/counts per second- also known as “rate of decay”. ? Alpha emission Release of alpha particle from, unstable nucleus (A 2+ helium ion or a helium nucleus. ? Alpha particle The nucleus of a helium Read more…

Chapter 9 – Atomic Physics

Atoms The smallest particle of an element that can enter into a chemical combo Electrons Negatively charged subatomic particles Quantum A discrete amount “packet” Photoelectric effect The emission of electrons that occurs when certain metals are exposed to light. Photon A “particle” of electromagnetic energy Dual nature of light Light Read more…

Physics: Atomic structure

Atom The smallest quantity of an element that can take part in a chemical reaction, consisting of a positively charged nucleus made up of protons and neutrons, surrounded by negatively charged electrons Nucleus The positively charged, dense region at the centre of an atom, made up of protons and neutrons, Read more…

Physics Chapter 10 Atomic Physics

3 Phenomena Blackbody radiation , the photoelectric effect, and atomic spectra. p.265 Blackbody Radiation states that a perfectly “black” body one that would absorb all light and other EM radiation incident upon it would also be a perfect emitter of EM radiation. Blackbody was said to emit blackbody radiation (BBR). Read more…

Year 12 Atomic Physics

Absorber Material that prevent radioactive emission from passing through it. ? Activity Number of radioactive emissions/counts per second- also known as “rate of decay”. ? Alpha emission Release of alpha particle from, unstable nucleus (A 2+ helium ion or a helium nucleus. ? Alpha particle The nucleus of a helium Read more…

Atomic/Nuclear Physics

John Dalton’s model All matter is made up of atoms. They are the smallest particles of matter and cannot be broken into smaller units. Joseph Thomson’s model (Cathode ray experiment) There are negative electrons. The overall charge of an atom is neutral. Plum pudding model – Negatively charged electrons are Read more…

Physics – atomic structure

What determines the atomic number? The number of protons What determines the mass number? No. neutrons + no. protons Define the term ion An atom with either more or less electrons than protons Define the term isotopes Different forms of an element with the same number of protons but a Read more…

Ch. 13: Atomic & Nuclear Physics

Introduction Light it wave-like. Photoelectric Effect Light shining on various metal surfaces cause electrons to be ejected from the surfaces. Birth of Quantum Theory Developed in 20th century by Mark Planck. Energy only occurs in small amounts called quanta. (Explains nuclear and radiaiton phenomena). E=hf-W Wave-Particle Duality The concept that Read more…

Nuclear Physics Vocabulary

Alpha decay the radioactive decay process in which the nucleus of an atom emits an alpha (helium) particle Beta decay occurs when a nucleus has too many neutrons for the protons present, a neutron converts to a proton, a negative electron is released, and an antineutrino is released Gamma radiation Read more…