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  1. ZainH

    Physics, Chemistry and Biology: Post your doubts here!

    Refractive index = Sin i (Angle of incidence) / Sin r (Angle of refraction) And your welcome x)
  2. ZainH

    Physics, Chemistry and Biology: Post your doubts here!

    A thermistor is easy, it's basically a resistor that's resistance changes depending on the temperature. If the temperature is HIGH then it's resistance FALLS, and if temperature is LOW then it's resistance INCREASES. A transistor.. well, it's a device that uses a smaller current to...
  3. ZainH

    Physics, Chemistry and Biology: Post your doubts here!

    For 6)b)i) you can clearly tell from the diagram it's 90 degrees. For b)ii) They mention in the question "at an angle of 43 degrees the ray is partially reflected", meaning the critical angle has to be something a little more then that or it could be 43. For b)iii) Now that you have the angle of...
  4. ZainH

    Physics, Chemistry and Biology: Post your doubts here!

    Well its a bit hard to tell like this, but if only one reflection is allowed then you would have to measure the angle of incidence of the ray with a protractor, and draw an equal angle of reflection. I'm guessing that the reflected ray would just leave the glass fibre, instead of hitting the...
  5. ZainH

    Chemistry ATP variant 61

    Lol, thats for weighing the mass of nails before the experiment to make sure they all weigh the same. What you "Wrote" was weigh the mass of nails at the end of the RUSTING to show that the lightest one had rusted the least :S Please tell me if you need help in understanding mark schemes ;)
  6. ZainH

    Chemistry ATP variant 61

    Lol I'm not.. hopefully we both get full marks from that question x)
  7. ZainH

    Chemistry ATP variant 61

    FOUND IT! And nothing about mass x) http://www.xtremepapers.com/papers/CIE/Cambridge%20IGCSE/Chemistry%20(0620)/0620_w10_ms_62.pdf (it's the last qustion btw)
  8. ZainH

    Chemistry ATP variant 61

    Er maybe not lol, I saw a question similiar to this in the past papers.. didn't mention anything about weight of nails. Sec if I find it I'll link it.
  9. ZainH

    Chemistry ATP variant 61

    -OPEN FOR DISCUSSION- If any of you are still up for it, if not then eh..
  10. ZainH

    Physics, Chemistry and Biology: Post your doubts here!

    LOL.. god I feel retarded. Gonna take a break :S
  11. ZainH

    Physics, Chemistry and Biology: Post your doubts here!

    Would that be the change in velocity? Pretty sure you'd have to subtract the two values for the "CHANGE" That's what I think atleast. 1.5m/s should be the answer
  12. ZainH

    Physics, Chemistry and Biology: Post your doubts here!

    Thanks for the replies guys, this helped! x)
  13. ZainH

    Physics, Chemistry and Biology: Post your doubts here!

    Small question, how can we tell when to use n = sin i/sin r and when to use n= sin r/sin i ? :S
  14. ZainH

    Good luck, cya x)

    Good luck, cya x)
    • ZainH
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  15. ZainH

    Haha same, I lost around 5 marks or something.. Kinda studying for physics atm, what about you?

    Haha same, I lost around 5 marks or something.. Kinda studying for physics atm, what about you?
    • ZainH
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  16. ZainH

    It was ): I knew the answers and stuff.. but eh, it was difficult compared to the past papers :s

    It was ): I knew the answers and stuff.. but eh, it was difficult compared to the past papers :s
    • ZainH
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  17. ZainH

    The very first thing u would do after papers end?

    Seriously? I've got 2 more exams but those are 2 weeks later.. Eh and there MCQ. SO I GUESS IM FREE AS WELL! :D
  18. ZainH

    Chemistry Paper 61

    Lol, anyways I'm off. Ill be discussing answers of today's paper tomorrow , in the thread I created. You could come and ask me anything in it if you want! (Cya guys, good luck with your studies!)
  19. ZainH

    Chemistry Paper 61

    Not worried at ALL about physics. Chemistry is my only weakness.. Phsyics should be easy x) I'll just go over the past papers I solved and there mark schemes.
  20. ZainH

    Chemistry Paper 61

    YOU can focus on business, because I don't take it x) I'll focus on physics for friday :S
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