Particle Physics

Question 1

If they say lg( x) what is the base

Answer 1

10! Not natural log stupid yute

Question 2

When they say atom structure based on alpha scattering what extra key things to say and why (2)

Answer 2

• Most of the mass is conc at centre = due to deflections occurring
• size if nuckeus very small compared to atom = due to most going through (empty space)

Question 3

When balancing quarks and have too many ine one side, how ti get rid of it

Answer 3

Conserve charge
If you have to mnay up, add an ANTIUP to conserve the charge

Or maybe two downs, look at question, if it’s a meson then gonna be two only so often use the anti that’s it!

Look at overall charge too if the particle produce, if negative your final answer can’t have 0 charge

Question 4

Main priority if hadron rather than Dan experience all 4 forces c

Answer 4

They experience the string nuclear!

Question 5

When describing string nuclear force, why can’t just say it acts between nucleons ?

Answer 5

Although it does

It also acts between QUARKS

So better way ti say it is it acts between quarks and nucleons
- short range of 3 fm
- from 0 to 0.5fm = repulsive , 0.5 to 3 attractive

Question 6

How ti explain density same using words

Answer 6

Protionality ideas, say mass propritnsk to A only, and v too

Thus as d = m/v, d don’t depend on anything

Question 7

DONT BE A BOT, HOW TO FIND THE PROTON AND NEUTRON NUMBER?

Answer 7

Proton number is at bottom!

Neutron yiu need to subtravt