Hey there! Sign in to join this conversationNew here? Join for free
    Offline

    2
    ReputationRep:
    (Original post by A+Hunter)
    It was 4 marks yeah. i can remember it clearly being 4
    Okay, Thanks man
    Offline

    8
    ReputationRep:
    How was half life 0.75kbq?
    Offline

    7
    ReputationRep:
    (Original post by Med_Diablo)
    How was half life 0.75kbq?
    Activity was 0.75kBq
    Offline

    2
    ReputationRep:
    (Original post by Med_Diablo)
    How was half life 0.75kbq?
    or 750 Bq
    Offline

    8
    ReputationRep:
    (Original post by A+Hunter)
    Activity was 0.75kBq
    Oh ok whatd you getrir half life then?
    Offline

    7
    ReputationRep:
    (Original post by Med_Diablo)
    Oh ok whatd you getrir half life then?
    They gave u the half life in the question. It was like 36 hours or something like that
    Offline

    1
    ReputationRep:
    What did you guys get for the question where they gave you a current/voltage graph and you had to comment on the resistance?

    It was only one mark but i got confused :/
    Offline

    1
    ReputationRep:
    Also what about the question about the washing machine where it gave you a circuit with a transistor and you had to explain how the heating element would switch off?
    • Thread Starter
    Offline

    6
    ReputationRep:
    (Original post by A+Hunter)
    Activity was 0.75kBq
    Activity after 144 hours is what you had to calculate with the initial activity being 12kBq and the 36 hours half life meaning every 36 hours it halved so you half it 4 times to get 0.75kBq

    Med_Diablo
    Offline

    2
    ReputationRep:
    (Original post by alex5023)
    What did you guys get for the question where they gave you a current/voltage graph and you had to comment on the resistance?

    It was only one mark but i got confused :/
    Yeah what did everyone write for this question ?
    Offline

    7
    ReputationRep:
    (Original post by sameehaiqbal)
    Activity after 144 hours is what you had to calculate with the initial activity being 12kBq and the 36 hours half life meaning every 36 hours it halved so you half it 4 times to get 0.75kBq

    Med_Diablo
    Yeah
    Offline

    7
    ReputationRep:
    (Original post by alex5023)
    What did you guys get for the question where they gave you a current/voltage graph and you had to comment on the resistance?

    It was only one mark but i got confused :/
    (Original post by Ethan100)
    Yeah what did everyone write for this question ?
    Increase/decrease the resisitance that's what i wrote.
    Offline

    2
    ReputationRep:
    (Original post by A+Hunter)
    Increase/decrease the resisitance that's what i wrote.
    Increase and decrease ? How both of them ?
    Offline

    3
    ReputationRep:
    (Original post by alex5023)
    What did you guys get for the question where they gave you a current/voltage graph and you had to comment on the resistance?

    It was only one mark but i got confused :/
    I mentioned that the resistance was increasing but not at a constant rate this is because of the temperature of of the lamp. I don't think I was specific enough though.

    http://www.bbc.co.uk/schools/gcsebit...ancerev5.shtml

    The filament lamp graph on bitesize explains it
    Offline

    7
    ReputationRep:
    (Original post by Ethan100)
    Increase and decrease ? How both of them ?
    I wrote increase or decrease the resisitance (was meant to write the resistance of the variable resisitor) in order to gain different values of the current+voltage.

    When resisitance goes up, current goes down and vice versa
    Offline

    2
    ReputationRep:
    (Original post by A+Hunter)
    I wrote increase or decrease the resisitance (was meant to write the resistance of the variable resisitor) in order to gain different values of the current+voltage.

    When resisitance goes up, current goes down and vice versa
    I just wrote the resistance will increase
    is that correct ?
    Offline

    8
    ReputationRep:
    Yeah I just talked about how voltage and current was not directly proportional so the lamp doesn't follow ohm's law
    Offline

    7
    ReputationRep:
    (Original post by Ethan100)
    I just wrote the resistance will increase
    is that correct ?
    Wait qhat question is this lol :P I'm lost
    Offline

    1
    ReputationRep:
    i just said the resistance will increase when both the current and the voltage increase.

    is that right??
    Offline

    3
    ReputationRep:
    If anyone has the paper, I'll look at it!
 
 
 
  • See more of what you like on The Student Room

    You can personalise what you see on TSR. Tell us a little about yourself to get started.

  • Poll
    Brussels sprouts
    Applying to university
  • See more of what you like on The Student Room

    You can personalise what you see on TSR. Tell us a little about yourself to get started.

  • The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

    Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

    Quick reply
    Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.