Particles and Radiation Y2 Flashcards
Which groups of particles are affected by the strong force?
Baryons and mesons
Which groups of particles are affected by the weak force?
Baryons, mesons and leptons
What type of particles are affected by the electromagnetic force?
Charged particles
Why do kaons have long life times?
They have a strangeness
How do hadrons interact?
Via the strong force
How do hadrons decay?
Via the weak force
How do mercury atoms in a fluorescent tube become excited?
Free electrons collide with orbital electrons transferring energy in the process
Why do excited mercury atoms emit photons of characteristic frequencies?
Atoms have discrete energy levels, electrons emit fixed amounts of energy when they de-excite, releasing photons of fixed amounts of energy
How does the coating on a fluorescent tube emit visible light?
It absorbs photons which are in the UV spectrum and re-emits photons of longer wavelength (visible light)
Define ground state
When electrons are in their lowest energy state
What is the similarity between excitation and ionisation?
Electrons receive energy
If the width of a single slit is reduced, how is the diffraction pattern affected?
Width of central maximum increases, intensity of central maximum decreases
How do you find order visible from a diffraction grating?
Find d/wavelength and round down to nearest whole number
When electrons de-excite, explain why photons of different frequencies can be produced
Excites electrons can de-excite by different routes
What type of neutrino is produced in a beta minus decay?
Anti-electron neutrino
