Physics 9702 P21

[JoBy1NoBa]

Can anyone tell me how many marks they will take off if I counted the number of wavelength wrongly (+.5) and carried on using it for the next questions?
The question has 2 marks for the +.5 thing and the next one has 3 marks.

 

[Mohamed1212]

Can anyone tell me how many marks they will take off if I counted the number of wavelength wrongly (+.5) and carried on using it for the next questions?
The question has 2 marks for the +.5 thing and the next one has 3 marks.

What was the number go Wavelengths anyway?

 

[JoBy1NoBa]

What was the number go Wavelengths anyway?

I believe it has 6 whole wavelengths, which then divides by the distance given in the figure.

 

[Mohamed1212]

I believe it has 6 whole wavelengths, which then divides by the distance given in the figure.

That's what I got. But what's the +.5 thing you're talking about?

 

[JoBy1NoBa]

That's what I got. But what's the +.5 thing you're talking about?

I didn't see the dot lines when I tried to figure out the n of wavelengths, so I got 6.5. *Silly mistake..

 

[Ahmedlool]

i got 188 for Fb

 

[NabzJ]

i got 188 for Fb

thats right

 

[RoyalPurple]

the current i got was 6A
i took the combined resistance to calculate the current
V = I(r+R)
12=I(0.5+1.5)
so I = 6A

this is correct
i got it where i did the mistake..and it was the silliest mistake i have eve made :/

 

[NabzJ]

What did you guys write for the alpha, beta & gamma radiation in the first part of question 7?

 

[IGCSE O/L student]

this is correct
i got it where i did the mistake..and it was the silliest mistake i have eve made :/

it's okay. you'll still get marks for the working you did.

 

[IGCSE O/L student]

What did you guys write for the alpha, beta & gamma radiation in the first part of question 7?

alpha- helium nucleus
beta- fast moving electron
gamma- electromagnetic radiation
i wrote it in a proper sentence in the paper.

 

[RoyalPurple]

it's okay. you'll still get marks for the working you did.

insha Allah

 

[omaaaar]

Guys pls vote over here what you expect to be the threshold for A in physics P21
https://www.xtremepapers.com/community/threads/physics-p21-gt-expectations-and-discussion.33779/

 

[Farouk123456]

alpha- helium nucleus
beta- fast moving electron
gamma- electromagnetic radiation
i wrote it in a proper sentence in the paper.

I wrote exactly like you but for the gamma: I wrote vibrating electrical and magnetic fields that travel through space without need for a medium. (This is the definition of an electromagnetic wave) Is this correct???

 

[IGCSE O/L student]

I wrote exactly like you but for the gamma: I wrote vibrating electrical and magnetic fields that travel through space without need for a medium. (This is the definition of an electromagnetic wave) Is this correct???

I have no idea. it must be correct, according to me. but i dont know if it is, according to CIE

 

[Ahmedlool]

guys did u use f=ma to find the resultant magnitude.i fot the acceleration from the graph and used the mass to get it.... plz need help

 

[areebaization]

guys did u use f=ma to find the resultant magnitude.i fot the acceleration from the graph and used the mass to get it.... plz need help

yeah I did the same thing as u i got 8400N

 

[areebaization]

Did someone get 0.04m as the wavelength?
I got 6.25 waves for 25cm length drawn in the figure. :/

 

[Xx_EMINEM_xX]

I got the resistance of each lamp 3 ohms, and the current 6 A
Moment part I got Fb= 188 N I don't exactly remember

 

[Xx_EMINEM_xX]

and in the amplitude question I think it was 1.5mm right?
and wavelength I counted the number of wavelengths and divided it by the number in the figure..