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Unlike in the English past tense, the French have two auxiliary 'helping' verbs - avoir and être, these become before the past participle, e.g. descendu. For example, j'ai mangé, and je suis allé.
So...

For every question it is best to start with a definition. Even if you're not sure how to approach and answer the question properly, a definition demonstrates knowledge and will reward you with a couple...

Differentiaiton from principles requires the use of the following formula which is provided in the formula booklet:

f'(x) = lim_h->0 ((f(x+h) - f(x))/(h))

Consi...

wave: interference experiments e.g. double slit experiment

particles: photo-electric effect