Now, before I say anything, this experiment doesn’t use actual gamma rays as they are dangerous and not allowed at school. Instead we will be investigating how the thickness of tracing paper affects the current produced from LDR (Light Dependant Resistor). This experiment is meant to mimic what will happen if we used gamma rays (the light ) and a different material (the tracing paper).
Firstly, let’s identify what the independent and dependant variables are:
Independent Variable – Thickness of tracing paper
Dependant Variable – Current in the circuit
Independent variable causes a change in Dependent Variable and it isn’t possible that Dependent Variable could cause a change in Independent Variable. So, the thickness of tracing paper causes a change in the current of the circuit.
Controlled Variables
Background light (meant to mimic background radiation), distance LDR is to light bulb, voltage, shroud, LDR, bulb, thickness and type of each individual tracing paper, ammeter, circuit and distance tracing paper is to LDR and bulb.
- LDR& circuit board
- Power supply
- Wire leads
- Milli-ammeter
- Lamp & holder
- Clamp stand, boss and clamp
- Small squares of tracing paper (roughly 5cm squared)
Set up
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| Circuit set up for Physics IAA experiment |
3) Connect the LDR with its black paper tube or shroud in series with a milli-ammeter and then connect the other ends of the leads across the same two terminals on the power supply.
Conclusion
(this is where you should use your results and scientific knowledge)
Ultimately, the thicker the tracing paper, the lower the current is. This is due to the tracing paper blocking some light from reaching the LDR (just like metal can block some gamma rays reaching its destination). This caused the LDR to absorb less light and therefore produce a lower current in the circuit. The graph starts off steep showing the thickness of tracing paper affects the current the most in the first few layers, then starts to level out towards the end. This just proves that the first few layers of tracing paper block out the most amount of light from reaching the LDR, while the layers after that have not as big an impact.
THANKS
your welcome 🙂
you’re
thank you sooo much!youre the best eveerrr:D
I assume it helped you lots!
YES!!:D it did thanks. Thanks very much once again:)
Thanks!
Your all welcome!
Very useful for my IAA. Not exactly the same but very similar. Using light and glass slides instead. Cleared alot of blank spots for me.
Thanks!
Glad to hear it proved useul to you 🙂
Very helpful, thank you!
Your welcome!
Ugh thank you so muuuch
You saved me ♥
Your very welcome!
Thanks alot!
Thanks a lot! Cleared up some blank spots.
REALLY HELPFUL! THANKS
YOU'RE AWESOME
Your all welcome!
this was extremely helpful thanks so much
especially the conclusion
This is the best site to go on, If you have internal IAA exams in school. Thanks you =D
thank you…i hope that the conclusion will be the same
Thank you sooooooooooo much this is exactly my IAA and it helped alot :'D
Bless you xx
jrf
Thank You
Thanks. helped a lot with my IAA!!
Thanks a lot. great help!
This helps soooo much! THANKS!! 🙂
This really helped. You literally gave me the whole write up for my physics iaa! Thanks loads!
yay! i have to do research for the IAA for thursday and now i have it all B) thank you sooo very muchh
heey! can you please relate the conclusion to if gamma rays were used? thank youu!
It's pretty difficult for me t do so conquering I have not done this experiment in ages and don't have much knowledge on gamma rays, sorry.
thannnkkkk youu soo uch hellped alot
THANKS A LOT ! my stupid science teacher will get the credit for my grade when it's all down to you – you're a star. btw, i got an a* for my biology iaa all down to you too ! saved my future you have 😎 x
hey! i have this IAA on thursday and i was just wondering about any safety aspects that i can note down? thank you!
From this experiment, the bulb will become hot and if you look into it it could hurt your eyes. If this was the actual experiment, the gamma rays that can cause serious radiation will be the biggest source of danger.
OMG THIS IS TOTAL AWESOME-NESS
YOUR TOTAL AWESOME-NESS
thanks
Dis will get me a better grade thanks to yu hardly knew anytin beforehand but yuve put things into perspective.. Your a great help onestli ta 😀 ..
how was this experiment valid? thank you
how could you improve the gamma rays methof
thank youuu so much <3
I've already stated how thr experiment has been made valid (look st the highlighted bits).
im just scared about how their going to make us relate to the gamma rays D:
could you please say the differences and advntges and disadv of using concrete or lead as a gamma shield?
I don't really know about that sorry.
DO you have any knowledge on the research question or the 2nd experiment method that is asked ?
Do you have any knowledge on the research question and the second experiment that may be asked on the iaa?
It is very similar to the first experiment and usually involves you answering questions how to make the second experiment valid reliable etc..
how would the diagram/circuit look if you only had a ldr in a in a circuit board connected to the milliammeter
The same as I have displayed above?
Can this experiment relate to the LDR experiment?
You will have to be a bit more specific what the LDR experiment is.
Gr8 m9
love you
thx bro dis was totes usefull safe G
Gr8 B8 M8
thankyouuuuuuuuuu
m
batty boys
thanks g, safe yeah
bless up