The Standard Model Flashcards
Link between Bohr model and line spectra production
Each line corresponds to an electron transition inside an atom
Energy of the photon produced is equal to energy transition inside atom
Formation of an absorption spectra
Missing lines appear in same position as those of an emission spectrum
Atom absorbs photons of exact energy as the gap in the energy levels
Electrons use this to move to a higher energy level
Why a line spectrum is observed for a particular element on an emission spectra
When electron falls between energy levels in an atom a fixed energy quantity is released
Each time the transition is made by an electron a photon is released
Photons = same frequency = same line produced
Presence of Fraunhofer lines in the Suns atmosphere allows
Elements to be identified in Suns outer atmosphere
Zero potential energy
When an electron has escaped from the field
Evidence for the Big Bang theory
Cosmological Redshift
Cosmic Microwave Background Radiation
Amount of hydrogen and helium in the universe
Examples of hot and cold stars
Blue dwarves are hot because they are of a higher frequency
Red Giants are cooler
Where did first evidence of neutrinos come from?
Beta decay
An electron is a
Lepton or fermion
Which quarks make up a neutron?
Two downs and one up
Which quarks make up an anti proton?
Two anti-ups and one anti-down
Why Neutral mesons are very short lived
Made up of two quarks
For charge to be an integer must be one quark and one anti-quark
Pair of matter-anti-matter particles annihilate themselves
Where did first evidence of neutrinos come from?
Beta decay
An electron is a
Lepton or fermion
Which quarks make up a neutron?
Two downs and one up
