Flashcards in Week 7 Compton Scattering & Threshold Energy Deck (11)

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1

## what is the condition to have a massless particle and why

###
v = c

so that γ = infinity meaning that γm requires m to 0

2

## what is the energy equation for a massless particle

### E = cp

3

## describe the Compton scattering experiment

###
fire a photon at a stationary particle

use a detector to measure the outgoing angle and energy of the resulting scattered particles

4

## what is the compton equation

### 1/E' = 1/E + (1-cosθ) / mc^2

5

## what does the compton equation tell us

### the relationship between the ingoing energy, outgoing energy and outgoing angle of the photon under the assumption it is massless

6

## what are the two ways to solve the compton equation

###
1 split the 4 vectors into their components straight away

2 stay in 4 vector for as long as possible

7

## what is it possible for a particle to do when colliding with another and what is the condition

### to change into another particle if there is sufficient energy

8

## what is the name for the minimum sufficient energy required to allow a particle collision to take place

### threshold energy

9

## what is the threshold energy equation if b is the new particle

### E > Mbc^2

10

## if particles collide with threshold energy what happens afterwards

### they are at rest since all energy was used to make the new particle so none is left over for kinetic energy

11