GUESS WHAT.

ITS OVER(:

missmichelle has completed/ endured/ survived through the GREAT week of promotion exams and proclaims herself free from overnight muggings, deep ugly eyebags and freezing cold exam halls!:DD
was wondering. how come they give wars names like GREAT world war I, GREAT world war II when it isnt that great (as in, wonderful) at all? anyways, shall just call this week the Great Promos.

but but, relieved as i am,
there isnt much partying to do even though we've the whole of next week free, everyone else is still having their exams! including my lil sis and you people out there in other jcs. anyways all the best to y'all!((((((:

okey so last night i was cramming for today's physics paper, this site proved to be quite useful
http://www.s-cool.co.uk/
yup and i was browsing through their waves notes and chanced upon this example:

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Example calculation

A man stands in a field at the foot of a cliff and yells. (He probably has a physics A-level exam tomorrow but has not yet found s-cool.co.uk!) He notices that if he continues to yell (at the same volume) as he walks towards the cliff, there are places where the volume of the yell seems to increase and decrease. If he moves forward 1 metre, he goes from one quiet place to the next quiet place. (One node to the next). What is the frequency of his yell? (Speed of sound in air =330ms-1).

Answer

The effect is due to a standing wave that he sets up with his own reflected yell. When he goes from quiet place to quiet place, he is moving from node to node.

If the distance between nodes is 1m, the wavelength must be 2m.

Using the wave equation, f = v/wavelength = 165Hz

At that frequency, it's more of a wail than a scream- but you get the idea..

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ahahahaha. dont you think its freaking funny. like it adds humour to your usual boring dull ol notes hehe. love the writer!

(: