**CCEA A2 Level Exams 2019 - Thread for discussing thought/predictions etc **

Original post by Aj2001brah

For Plasma heating

High frequency Em waves are an auxiliary heating method and used when the temperature of the plasma is already extremely high

A particles just talked about their mass and how they experience the strong nuclear force etc

wots this about? when did we have to talk about strong nuclear force?

I talked about radio frequency heating and ion cyclotron resonance heating for ions and ECRH for electrons
and mentioned the frequencies used - 45-55MHz for ions and 190GHz for electrons

Reply 87

It asked about their penetration. I just knew that electrons don’t experience it and therefore can be used to penetrate close to the nucleus but a particles do and therefore have weak penetration ability.

Alpha particles experience a slight deflection in magnetic and electric fields due to their mass. They occur as a result of radioactive decay (ejection of a helium nucleus) . Poor range in air as they collide with air particles and lose KE etc

Reply 88

Original post by Aj2001brah

It asked about their penetration. I just knew that electrons don’t experience it and therefore can be used to penetrate close to the nucleus but a particles do and therefore have weak penetration ability.

Alpha particles experience a slight deflection in magnetic and electric fields due to their mass. They occur as a result of radioactive decay (ejection of a helium nucleus) . Poor range in air as they collide with air particles and lose KE etc

damn I forgot about the loss of ke by collision part

Reply 89

Dont worry. Everyone here saying they got 1.40 for the tension and it was easy

Here’s me doing sin/cos and all getting 40 something i think so **** that

The first question was aidsy, they asked for K in Nmm-1 ans the graph it was 1/gradient then you had to calculate the young modulus so had to go and change it to M again and took me ages lmao

(edited 4 years ago)

Reply 90

Sharpshooter

20

What were you supposed to write for the mass of the molecule?

Wrote PV = (1/3)Nm<c^2> but couldn't figure it out since I didn't have Volume, only lost 2 marks but it annoyed me.

Reply 91

3/2 kt = 1/2 mv2 you had t and v2

Reply 92

Original post by Aj2001brah

Dont worry. Everyone here saying they got 1.40 for the tension and it was easy

Here’s me doing sin/cos and all getting 40 something i think so **** that

The first question was aidsy, they asked for K in Nmm-1 ans the graph it was 1/gradient then you had to calculate the young modulus so had to go and change it to M again and took me ages lmao

yeah I thought we had to use sine cosine too - but they didn't ask for the angle - so a simple a^2 + b^2 would have sufficed

yeah the first question was a bit annoying - they tried to trick you but good thing we caught it
they also tried to trick you into thinking the diameter was 40mm rather than 0.4mm

Reply 93

Original post by Sharpshooter

What were you supposed to write for the mass of the molecule?

Wrote PV = (1/3)Nm<c^2> but couldn't figure it out since I didn't have Volume, only lost 2 marks but it annoyed me.

6.6somethingx10^-27 i think

Reply 94

can someone help me count all the questions -I'm feeling a bit paranoid that maybe i forgot to do one

1. Deformation of solids
2. Circular motion
3. SHM
4. That weird question with the aluminum block
5.
6. maybe the question about the 150 million Kelvin temp.
7. p = 1/3 pc^2 questions
8. Alpha particle 6 marker QWC question
9. Radioactivity/Decay + synoptic part in end

what were the other 2 on

(edited 4 years ago)

Reply 95

What did you sraw for the KE graph?

Was it positive cycles only because it’s v^2 ?

Reply 96

Original post by Aj2001brah

What did you sraw for the KE graph?

straight line through origin with Kelvin temp on x axis

Reply 97

I mean the Ke graph for the pendulum

Original post by 134841422

straight line through origin with Kelvin temp on x axis

Reply 98

Original post by Aj2001brah

I mean the Ke graph for the pendulum

my bad

I basically drew the same thing as for the velocity graph except my line didn't dip below x - axis at any time
it increased and decreased regularly above x axis

Reply 99