Physics O levels complete discussion

[17194]

oh, damn. its D.

No, they are also radioactive.

 

[Fallen316]

No, they are also radioactive.

no they are not.
a SOURCE is radioactive.
it emits alpha,beta,gamma are not radioactive.

 

[17194]

no they are not.
a SOURCE is radioactive.
it emits alpha,beta,gamma are not radioactive.

Oh right, thanks for pointing it out.

 

[17194]

How are are diverging lenses different from converging in terms of the ray diagrams we have to draw. I only learned about converging.

 

[Play Maker]

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

in
In the A.C generater it should be said that:
the magnetic field lines cut the wire, there is a change in magnetic flux linkage and hence an e.m.f is induced.

 

[snoonono]

guys explanation for the pendulum and all equations required plzzzzzzzzzzzzzzzzzzzzzzzzzzz

 

[17194]

Can someone describe a simple experiment to show refraction of sound?

 

[snoonono]

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

learn this table, and search for half life of radioactive substances and study that too

 

[daredevil]

1) it acts as a magnifying glass to read the temperature
2)B
3) and 4)
1. i dont know, maybe , make sure it works
2.check for parallax error
* isn't this an atp question ? 3 and 4 ?

2) answer's wrong. its D
3 and 4 : i think so too but saw them in a theory paper.

 

[daredevil]

oh, damn. its D.

but howw??? alpha particles aren't radioactive?? what does this mean??? :angry:

 

[Fallen316]

but howw??? alpha particles aren't radioactive?? what does this mean??? :angry:

as i mentioned earlier above
the SOURCE is radioactive, not the particles it emits.

 

[17194]

Hey the refrigerator and thermos flask aren't in the course right?

 

[kitecrystal]

Hey the refrigerator and thermos flask aren't in the course right?

go through the working of refrigerator in terms of convection currents of air produced in it.and for t.flask,learn which method of heat transfer is prevented by which part e.g. radiation by shiny surface..

 

[17194]

go through the working of refrigerator in terms of convection currents of air produced in it.and for t.flask,learn which method of heat transfer is prevented by which part e.g. radiation by shiny surface..

Yeah but I can't seem to find it in the syllabus, I don't think it's included.

 

[kitecrystal]

Yeah but I can't seem to find it in the syllabus, I don't think it's included.

you may quote these as examples of heat transfer somewhere.p.s the concept will get cleared,rest is upto u

 

[sifat azeem]

uuuuhhhmm.... your defenation of potential difference doesn't make sense.and i think its wrong ....... :O

acually emf is the energy required to move a unit charge along a complete circuit while pd is the energy taken in by the components of the circuit!!!

 

[GrunT]

Could anyone please explain nuclear fision reaction i.e break down of uranium into barium and all.
Also I have no idea what transistors are, PnP and nPn crap.

 

[sifat azeem]

can anyone please explain when calculating the work done when moving say a block up a slope, shoulg we take the vertical height or the distance it moved?

 

[rabiafarooq101]

CRO anyone plz help

 

[snoonono]

CRO anyone plz help

part 1. cathode which emitts hot fast moving electrons
part 2. anode(s) which would increase speed of electrons i think
the y and x plates to control where the beam of electrons would land on the screen
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