Physics O levels complete discussion

[daredevil]

hey guyss discuss all physics problems here. Also plz give any notes or worksheets or questions on the chapter "Light"

 

[Tharindu]

Yep me too...hate light

 

[IARK]

Dnt we have a sticky for this?

 

[daredevil]

Dnt we have a sticky for this?

sticky?

 

[Fallen316]

Physics Definitions

1. Speed – Distance travelled per unit time.
2. Velocity – Rate of change of displacement.
3. Acceleration – Rate of change of velocity.
4. Electromagnetic induction is the phenomenon of producing an emf in a circuit due to changing magnetic field.
5. Amplitude refers to the maximum displacement from rest position.
6. Wavelength refers to the distance between one crest to the next successive crest.
7. Frequency refers to the number of waves produced per unit time.
8. Period refers to the time taken for one complete wave.
9. Speed refers to the distance travelled by the wave per unit time.
10 Echo is reflected sound from hard and smooth surfaces.
11. Sound is produced by vibrations placed in a medium
12. A Wave is a phenomenon in which energy is transferred through vibrations
13. Transverse waves are waves where the direction of travel is perpendicular to the direction of vibration of particle in a medium. (Light/water are transverse waves)
14. Longitudinal waves are waves where the direction of travel is parallel to the direction of vibration of particles in a medium. (Sound is longitudinal wave)
15. Kinetic energy – The ability to do work due to the object’s speed.
16. Gravitational Potential energy – The ability to do work due to the object’s height.
17. Inertia is an object’s resistance to a change in velocity. (Heavier objects have greater inertia)
18. Work is done when an object moves in the same direction of the force acting on it.
19. Refraction is the bending of light ray as it travels across 2 different mediums
20. Density – Mass per unit volume

 

[GrunT]

There's just 1.5 days left till the Physics examination and I don't know what to do, should I go through the book ? I can finish it fast or should I do only past papers ? Note that I hardly have any past paper practice for Physics.

 

[Fallen316]

There's just 1.5 days left till the Physics examination and I don't know what to do, should I go through the book ? I can finish it fast or should I do only past papers ? Note that I hardly have any past paper practice for Physics.

physics is mainly concept. I suppose in this short time you should do the book thoroughly, which will make your p2 seem really easy
do only mcq's from past papers

 

[IARK]

There's just 1.5 days left till the Physics examination and I don't know what to do, should I go through the book ? I can finish it fast or should I do only past papers ? Note that I hardly have any past paper practice for Physics.

If u do book n mcqs, ull revise ur work faster. If possible, jsut look at some of the questions in theory. It will give you an idea of what kind of questions the examiners are fond of giving.

 

[daredevil]

There's just 1.5 days left till the Physics examination and I don't know what to do, should I go through the book ? I can finish it fast or should I do only past papers ? Note that I hardly have any past paper practice for Physics.

u probably have enough concepts of physics ... so just overview the book if u haven't revised it before. then do the past papers as many as u can. also go through the examiner's tips; marking schemes for about 3-4 years and examiners' report for at least 1-2 years and u'll do fine. that is my suggestion. if u're really good at physics then u may not even need to go through the book. u can just start straightaway from the past papers. and it's all revised. Best of Luck

 

[daredevil]

Physics Definitions

1. Speed – Distance travelled per unit time.
2. Velocity – Rate of change of displacement.
3. Acceleration – Rate of change of velocity.
4. Electromagnetic induction is the phenomenon of producing an emf in a circuit due to changing magnetic field.
5. Amplitude refers to the maximum displacement from rest position.
6. Wavelength refers to the distance between one crest to the next successive crest.
7. Frequency refers to the number of waves produced per unit time.
8. Period refers to the time taken for one complete wave.
9. Speed refers to the distance travelled by the wave per unit time.
10 Echo is reflected sound from hard and smooth surfaces.
11. Sound is produced by vibrations placed in a medium
12. A Wave is a phenomenon in which energy is transferred through vibrations
13. Transverse waves are waves where the direction of travel is perpendicular to the direction of vibration of particle in a medium. (Light/water are transverse waves)
14. Longitudinal waves are waves where the direction of travel is parallel to the direction of vibration of particles in a medium. (Sound is longitudinal wave)
15. Kinetic energy – The ability to do work due to the object’s speed.
16. Gravitational Potential energy – The ability to do work due to the object’s height.
17. Inertia is an object’s resistance to a change in velocity. (Heavier objects have greater inertia)
18. Work is done when an object moves in the same direction of the force acting on it.
19. Refraction is the bending of light ray as it travels across 2 different mediums
20. Density – Mass per unit volume

thanks dude!! real good.

 

[daredevil]

hope this helps formulas are the backbone of physics so remember to revise all of them and practice questions to get the hang of applying them.

 

[khalil]

There's just 1.5 days left till the Physics examination and I don't know what to do, should I go through the book ? I can finish it fast or should I do only past papers ? Note that I hardly have any past paper practice for Physics.

Well my personal view is , never discard the book . You have to brush up on your concepts . And attempt the newest papers and you'll do fine .

 

[Fallen316]

RANDOM NOTES!!​

​

Ways to increase emf in solenoid​

1.Use a stronger magnet.
2.Increase the speed of moving the magnets.
3.Increase the number of turns on the coil.

Ways to increase emf in a.c. generator
1.Decrease distance between the magnet and coil.
2.Use a stronger magnet.
3.Increase speed of moving the magnets
4.Increase number of turns in the coil.

When a water wave moves from deep to shallow
1.Wavelength become shorter
2.Frequency remains the same
3.Speed becomes slower

Factors that affect speed of sound
1.Temperature – The higher, the faster
2.Medium – Solid is faster than liquid, which is faster than gas
3.Humidity – More humid faster than less humid

Characteristics of Image formed on plane mirror
1.Same size
2.Laterally inverted
3.Image is virtual
4.Distance of object from mirror is = distance of image from mirror
5.Same colour
6.Inverted front to back

Precautions when handling radioactive substances
1.Radioactive substances should not be touched.
2.Do not point their rays at any person.
3.Wear a photosensitive badge to check whether a person is exposed to an overdose of radiation.

Operation of Transformer
1.Alternating current is supplied to primary coil.
2.Alternating current causes iron core to magnetise and magnetic field to change.
3.Magnetic fields follow iron core and link to secondary coil.
4.Hence emf is induced in secondary coil by electromagnetic induction.

Operation of AC Generator
1.Turn the wire.
2.The wire cuts through the magnetic field as it turns.
3.This produces an induced emf.
4.Because of the load, an induced current is produced.

Process of creating Convection current
1.The bottom layer is heated, the molecules move faster.
2.The density decreases and hot water rises.
3.Cooler and denser water above sinks down and takes its place.
4.Convection current is due to a change in density.

Difference between evaporation & boiling:
EVAPORATION/BOILING
1.Takes place on the surface/Occurs throughout the liquid
2.Temperature may change in this process/Temperature remains constant
3.Takes place at any temperature/Takes place at a constant temp.
4.Artificial heating is not required/Artificial heating is required.
5.Slow Process/Fast Process.

CLICK LIKE IF IT HELPED

 

[nightmaressana]

RANDOM NOTES!!

Ways to increase emf in solenoid​

1.Use a stronger magnet.
2.Increase the speed of moving the magnets.
3.Increase the number of turns on the coil.

Ways to increase emf in a.c. generator
1.Decrease distance between the magnet and coil.
2.Use a stronger magnet.
3.Increase speed of moving the magnets
4.Increase number of turns in the coil.

When a water wave moves from deep to shallow
1.Wavelength become shorter
2.Frequency remains the same
3.Speed becomes slower

Factors that affect speed of sound
1.Temperature – The higher, the faster
2.Medium – Solid is faster than liquid, which is faster than gas
3.Humidity – More humid faster than less humid

Characteristics of Image formed on plane mirror
1.Same size
2.Laterally inverted
3.Image is virtual

Precautions when handling radioactive substances
1.Radioactive substances should not be touched.
2.Do not point their rays at any person.
3.Wear a photosensitive badge to check whether a person is exposed to an overdose of radiation.

Operation of Transformer
1.Alternating current is supplied to primary coil.
2.Alternating current causes iron core to magnetise and magnetic field to change.
3.Magnetic fields follow iron core and link to secondary coil.
4.Hence emf is induced in secondary coil by electromagnetic induction.

Operation of AC Generator
1.Turn the wire.
2.The wire cuts through the magnetic field as it turns.
3.This produces an induced emf.
4.Because of the load, an induced current is produced.

Process of creating Convection current
1.The bottom layer is heated, the molecules move faster.
2.The density decreases and hot water rises.
3.Cooler and denser water above sinks down and takes its place.
4.Convection current is due to a change in density.

Difference between evaporation & boiling:
EVAPORATION BOILING
1.Takes place on the surface Occurs throughout the liquid
2.Temperature may change in this process Temperature remains constant
3.Takes place at any temperature Takes place at a constant temp.

CLICK LIKE IF IT HELPED

really helped. thanx

 

[farahdar]

Any notes for radioactivity? Have never studied it..:/

 

[Fallen316]

Any notes for radioactivity? Have never studied it..:/

nup.
its easy , just study from ANY book and u'll understand it.

 

[daredevil]

​

Characteristics of Image formed on plane mirror
1.Same size
2.Laterally inverted
3.Image is virtual

added 2 points:
4. distance of object from mirror is equal to distance of image from mirror.
5. same colour
6. inverted front to back

 

[Fallen316]

added 2 points:
4. distance of object from mirror is equal to distance of image from mirror.
5. same colour
6. inverted front to back

three were enough .
But still, thank you

 

[daredevil]

Any notes for radioactivity? Have never studied it..:/

if u got Physics for You by Keith Johnson study it from there. otherwise study it from Explaining Physics by Stephen Pople. u'll get it. its pretty much based on learning... most of it at least.

 

[daredevil]

Difference between evaporation & boiling:EVAPORATION BOILING
1.Takes place on the surface Occurs throughout the liquid
2.Temperature may change in this process Temperature remains constant
3.Takes place at any temperature Takes place at a constant temp.
4.Artificial heating is not required. Artificial heating is required.
5.Slow Process. Fast Process.