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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

time is equal to time in free fall i.e. 50m=0.5gt^2 -> t=root(50m*2/g)=1.019s

horizontal distance is then tv= 1.019s20m/s=20.38m

multiply with conjugate 5-root3 such that the denominator gets rational 

(5-root3)^2/((5+root3)(5-root3)) = (25-10root3+3)/(25-3)=(28-10root3)/22 = 14/11 - 5root3/11