Need to know Flashcards
What is a frame of reference?
An arbitrary set of exes with reference to which the position or motion of something is described
What is an inertial frame of reference?
A non-accelerating frame of reference that Newton’s laws of motion hold
What is time dilation?
The difference in time intervals between two events as measured by observers moving with their respected objects
What is proper length and proper time interval?
The time and length between two events measured by an observer at rest
What is relativist length, momentum and time interval?
the length, time or momentum measured by an observer moving with an object
What is Plank’s constant?
A fundamental constant used in quantum mechanics that related frequency to energy
What is work function?
The minimum energy required to remove an electron from a solid.
What is the work function equation?
W = hf
What is a baryon?
Made up of three quarks
What is a meson?
1 quark and 1 antiquark held together by strong nuclear force
How do muons not apply to Newtonian plysics?
They travel close to the speed of light, have a short life span and scientists predicted from this life that only a small number would make it to the bottom of the mountain. But due to length contraction and time dilation, heaps made it.
What are the two postulates of special relativity?
Laws of physics are the same in all frames, speed of light constant is the same in vacuum
How does young’s double-slit provide evidence for wave model of light?
Displays the rainbow, constructive interferences cancelling out wavelengths, if it wasn’t a wave, there would just be two straight lines. The constructive interferences creates a diffraction pattern, the circles of light
What are the six types of leptons?
Electron, electron neutrino, muon, muon neutrino and tau and tau neutrino
What are the 4 types of guage bosoms?
Photon, gluon and W and Z
Guage bosoms in terms of forces?
Strong (gluon), weak (W and Z) electromagnetic (photon)
