Biology; Chemistry; Physics: Post your doubts here!

[Awesome12]

Are you sure it's there in the syllabus? I mean my teacher told me that this diode thing is no more in the syllabus. I had no idea what 'rectification' meant. Thanks, btw.

It is part of electronics. I don't know exactly whether it is in the syllabus or not, but don't forget to study
Diode, Thermistor, LDR, and CRO

 

[Dream.Eater]

Are you sure it's there in the syllabus? I mean my teacher told me that this diode thing is no more in the syllabus. I had no idea what 'rectification' meant. Thanks, btw.

It is there in the syllabus. This is from the 2014 5054 physics syllabus

Its not like thermonuclear astrophysics, its a simple concept. You just have to know what a diode is, what it does, how to include it in a circuit diagram and about rectifying AC currents

 

[Dream.Eater]

It is part of electronics. I don't know exactly whether it is in the syllabus or not, but don't forget to study
Diode, Thermistor, LDR, and CRO

And LED and deflection tube as well

 

[Dream.Eater]

Could someone tell me how to do Q32 in the 2009 ON Chemistry paper 1?
Its about concentration of H+ ions in H2SO4

 

[funky brat]

Could someone tell me how to do Q32 in the 2009 ON Chemistry paper 1?
Its about concentration of H+ ions in H2SO4

Is the answer D?

 

[funky brat]

It is there in the syllabus. This is from the 2014 5054 physics syllabusView attachment 37959

Its not like thermonuclear astrophysics, its a simple concept. You just have to know what a diode is, what it does, how to include it in a circuit diagram and about rectifying AC currents

Well thanks a lot then.
What is thermonuclear astrophysics btw?

 

[Dream.Eater]

Is the answer D?

Its c ( 0.1g/dm3)

 

[funky brat]

[funky brat, post: 729567, member: 21433"]Well thanks a lot then.
What is thermonuclear astrophysics btw?

i heard that in The Avengers[/quote]
Lol. Okay.

 

[Dream.Eater]

Well thanks a lot then.
What is thermonuclear astrophysics btw?

I heard it in The Avengers

 

[funky brat]

Its c ( 0.1g/dm3)

Idk then. Let's wait for someone else. What does the ER say about this MCQ?

 

[Dream.Eater]

Idk then. Let's wait for someone else. What does the ER say about this MCQ?

ER doesn't say anything about Q32

 

[funky brat]

ER doesn't say anything about Q32

I think it's something related to ionisation like there are more hydrogen ions than sulphate ions in the solution.

 

[funky brat]

Could someone tell me how to do Q32 in the 2009 ON Chemistry paper 1?
Its about concentration of H+ ions in H2SO4

Okay first you need to calculate the molarity in g/dm^3. For this apply the formula g/dm^3= mol/dm^3 into mass of 1 mole of solute.
0.05*98= 4.9 g/dm^3
If 98g gives 4.9 g/dm^3 then 2 g (mass of hydrogen in acid) gives x g/dm^3
This gives you the answer 0.10 g/dm^3.

 

[***amd***]

Could someone tell me how to do Q32 in the 2009 ON Chemistry paper 1?
Its about concentration of H+ ions in H2SO4

its like 1 mole of Acid contains 2 moles of Hydrogen, so the conc. of H will be double the concentration of H2SO4. simple.

 

[exploded diper]

Do both

K thx bro

 

[exploded diper]

Wht is a defle

And LED and deflection tube as well

ction tibe

 

[funky brat]

Wht is a defle

ction tibe

It is a part of CRO. CRO includes electron gun, deflection tube and a fluorescent screen.

 

[exploded diper]

It is a part of CRO. CRO includes electron gun, deflection tube and a fluorescent screen.

Oh thought it was a sperate thing...thx

 

[Dream.Eater]

It is a part of CRO. CRO includes electron gun, deflection tube and a fluorescent screen.

Actually, there is a difference between the deflection tube and CRO.
The deflection tube consists of the gun but has only the Y plates which cause vertical movement of the beam.
Its used to study properties of a beam of electrons.
But, the CRO is more complex.
Google both the deflection tube and CRO and compare the images. You'll see the difference

 

[exploded diper]

Actually, there is a difference between the deflection tube and CRO.
The deflection tube consists of the gun but has only the Y plates which cause vertical movement of the beam.
Its used to study properties of a beam of electrons.
But, the CRO is more complex.
Google both the deflection tube and CRO and compare the images. You'll see the difference

Cool