** HL Physics Before / after **

MarieCurie22

decisions wrote: »

Pressure is inversely proportional to volume for a fixed mass of gas at a constant temp(?)

Yup!
When you answer attach a question after it

Ok So....Newtons 2nd law of motion?

Leaving Cert Student

Rate of chage of momentum is directly prop. to force causing it in direction of said force...

Why is an approximate focal length obtained beforehand when measuring focal length of convex mirror and how is it obtained?

MarieCurie22

Leaving Cert Student wrote: »

Rate of chage of momentum is directly prop. to force causing it in direction of said force...

Why is an approximate focal length obtained beforehand when measuring focal length of convex mirror and how is it obtained?

To ensure you dont place the object within the focal length as if you do a virtual image will be produced?

****obtained by locating a distance object on a screen this way 1/u approx =0 therefore 1/v =1/f

Coulombs law?

AB2013

MarieCurie22 wrote: »

To ensure you dont place the object within the focal length as if you do a virtual image will be produced?

****obtained by locating a distance object on a screen this way 1/u approx =0 therefore 1/v =1/f

Coulombs law?

The force of attraction or repulsion of two point charges is directly proportional to the product of their charges and inversely proportional to the square of the distance between them.

Define electromagnetic induction?

MarieCurie22

AB2013 wrote: »

The force of attraction or repulsion of two point charges is directly proportional to the product of their charges and inversely proportional to the square of the distance between them.

Define electromagnetic induction?

Whenever the magnetic field passing though a coil changes an emf appears in the coil.

List the fundamental forces of nature in increasing strength order!?

AB2013

MarieCurie22 wrote: »

Whenever the magnetic field passing though a coil changes an emf appears in the coil.

List the fundamental forces of nature in increasing strength order!?

Gravitational, weak nuclear, electromagnetic, strong nuclear?

Faraday's law?

MarieCurie22

AB2013 wrote: »

Gravitational, weak nuclear, electromagnetic, strong nuclear?

Faraday's law?

The size of the induced EMF is directly proportional to the rate of change of flux.


Why are circular particle accelerators better than linear?

Leaving Cert Student

MarieCurie22 wrote: »

The size of the induced EMF is directly proportional to the rate of change of flux.


Why are circular particle accelerators better than linear?

Higher speeds reached, more compact.

Distinguish between fusion and fission

MarieCurie22

Leaving Cert Student wrote: »

Higher speeds reached, more compact.

Distinguish between fusion and fission

Fusion is the combing of 2 smaller nuclei to form a larger one energy is released.

Fission is the splitting of a large nucleus into 2 or more smaller nuclei with the release of energy and neutrons.

Why is great amounts of energy needed for fusion?

AB2013

MarieCurie22 wrote: »

The size of the induced EMF is directly proportional to the rate of change of flux.


Why are circular particle accelerators better than linear?

They take up less space and allow particle to reach higher speeds.

Law of flotation?

Leaving Cert Student

MarieCurie22 wrote: »

Fusion is the combing of 2 smaller nuclei to form a larger one energy is released.

Fission is the splitting of a large nucleus into 2 or more smaller nuclei with the release of energy and neutrons.

Why is great amounts of energy needed for fusion?

To overcome the force of repulsion between the nuclei. State 3 advantages of fusion over fission

MarieCurie22

AB2013 wrote: »

They take up less space and allow particle to reach higher speeds.

Law of flotation?

The weight of a floating body is equal to the weight of fluid it displaces.

Emf?

Leaving Cert Student

AB2013 wrote: »

They take up less space and allow particle to reach higher speeds.

Law of flotation?

For a floating body, the weight of the body is equal to the weight of the fluid it displaced.

Give the nuclear equation which led to the discovery of the neutrino

MarieCurie22

Leaving Cert Student wrote: »

To overcome the force of repulsion between the nuclei. State 3 advantages of fusion over fission

Fusion resources more readily available.
Fusion more easily controlled no chance of uncontrolled chain rxn.
Fusion has little or no radioactive waste


THE ampere?

Leaving Cert Student

MarieCurie22 wrote: »

The weight of a floating body is equal to the weight of fluid it displaces.

Emf?

An emf is simply P.d applied to a circuit? Not sure actually what is it?

Leaving Cert Student

MarieCurie22 wrote: »

Fusion resources more readily available.
Fusion more easily controlled no chance of uncontrolled chain rxn.
Fusion has little or no radioactive waste


THE ampere?

The ampere is that current which, if maintained in two infinitely long parallel wires of negligible cross-sectional area 1m apart in a vacuum, experiences a force of 2x10^7 newtons per metre length.

Capacitance definition?

MarieCurie22

Leaving Cert Student wrote: »

The ampere is that current which, if maintained in two infinitely long parallel wires of negligible cross-sectional area 1m apart in a vacuum, experiences a force of 2x10^7 newtons per metre length.

Capacitance definition?

C=qV

WHERE c = capacitance
q = carge
v = voltage

Undeadfred

Leaving Cert Student wrote: »

The ampere is that current which, if maintained in two infinitely long parallel wires of negligible cross-sectional area 1m apart in a vacuum, experiences a force of 2x10^7 newtons per metre length.

Capacitance definition?

ratio of charge on conductor to its potential

Derive F=qvB

AB2013

Undeadfred wrote: »

ratio of charge on conductor to its potential

Derive F=qvB

F= BIl

I= total charge/ time.
Total charge= number of particles x charge on each particle= nq
=> I= nq/t
for 1 particle n=1 => I=q/t

F=B(q/t)l
F=Bq(l/t)
l/t=> distance/time = velocity (v)

Therefore F= Bqv

What is thermionic emission?

yoppo

AB2013 wrote: »

F= BIl

I= total charge/ time.
Total charge= number of particles x charge on each particle= nq
=> I= nq/t
for 1 particle n=1 => I=q/t

F=B(q/t)l
F=Bq(l/t)
l/t=> distance/time = velocity (v)

Therefore F= Bqv

What is thermionic emission?

Emission of an e- from the surface of a metal due to heat.

Explain what is meant by total internal reflection?

optimus125

AB2013 wrote: »

What is thermionic emission?

The giving off of electrons from the surface of a hot metal.

Here we go: A kaon consists of a strange quark and an up anti-quark. What type of hadron is a kaon?

AB2013

optimus125 wrote: »

The giving off of electrons from the surface of a hot metal.

Here we go: A kaon consists of a strange quark and an up anti-quark. What type of hadron is a kaon?

Hmm a meson? These are in the tables book so I don't learn them

What is the photoelectric effect?

Leaving Cert Student

AB2013 wrote: »

Hmm a meson? These are in the tables book so I don't learn them

What is the photoelectric effect?

the emission of electrons from the surface of a metal when light of suitable frequency shines on it

Leaving Cert Student

show that f=ma is a special case of netwons 2nd law

Undeadfred

Leaving Cert Student wrote: »

show that f=ma is a special case of netwons 2nd law

f£mv-mu/t (netwon's second law def.)
f£m(v-u/t)
f£ma (a=v-u/t)
f=kma
1=k(1)(1) (def. of Newtown)
f=ma

Give the quark composition of a neutral, positive and negative pion

Leaving Cert Student

Undeadfred wrote: »

f£mv-mu/t (netwon's second law def.)
f£m(v-u/t)
f£ma (a=v-u/t)
f=kma
1=k(1)(1) (def. of Newtown)
f=ma

Give the quark composition of a neutral, positive and negative pion

positive: Up, anti-down
Negative: down, anti-up
neutral: up, anti-strange??

Undeadfred

Leaving Cert Student wrote: »

positive: Up, anti-down
Negative: down, anti-up
neutral: up, anti-strange??

Positive and Negative are right, up anti-strange is a Kaon so thats not it. I think its up anti-up or down anti-down. Both possibilities can happen. I'm not 100% sure though cause its not in my book

Theometric Property of a thermocouple?

Leaving Cert Student

Undeadfred wrote: »

Positive and Negative are right, up anti-strange is a Kaon so thats not it. I think its up anti-up or down anti-down. Both possibilities can happen. I'm not 100% sure though cause its not in my book

Theometric Property of a thermocouple?

EMF

4 other thermo propsies?

no scope codgod

Leaving Cert Student wrote: »

EMF

4 other thermo propsies?

Pressure of a gas at a fixed volume.
Volume of a gas at fixed pressure.
Length of a liquid column.
Resistance of a thermistor.

Derive Kepler's 3rd Law.

VincentLeB

I realise it's impossible for "well-informed" predictions to exist, but does anyone have any predictions for Section A that seem to at least make sense?

It would be cool if we could all state our logic, too!