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IB Higher level maths IA

I am currently planning my HL maths IA. I am not sure what topic is okay and what topic is not okay, and the level of mathematics required in the IA.
I would like to do a topic related to the speed of sound in the air VS the temperature. But there are a lot of equations out there already about how to calculate the speed in a given temp. So the difficulty and the level of maths is not suitable.
Is there anything else that is related to the mach number, speed of sound in the air that I can do for my IA which incoorperates the level of maths I need to do? Im running out of ideas.


Thanks

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