Qualification > Sciences
physics help needed........plz
elemis:
Dude, the MS says the answer is C ::)
How could say I was correct ? My answer and explanation is wrong.
ashwinkandel:
ohh i m really sorry. i apolologise for this i mistakely looked another marking scheme.
elemis:
--- Quote from: ashwinkandel on October 03, 2010, 02:38:07 pm ---ohh i m really sorry. i apolologise for this i mistakely looked another marking scheme.
--- End quote ---
I'll be honest too... I really dont know how its C :P
Deadly_king:
--- Quote from: ashwinkandel on October 03, 2010, 01:26:51 pm ---one more question related to this:
5 A student makes measurements from which she calculates the speed of sound as 327.66ms–1.
She estimates that her result is accurate to ±3 %.
Which of the following gives her result expressed to the appropriate number of significant figures?
A 327.7ms–1 B 328ms–1 C 330ms–1 D 300ms–1
--- End quote ---
Let delta C = c where C is the speed of sound.
% uncertainty = c/C * 100
3 = c/327.66 * 100 ---> c = 9.8
But c is taken as 10 since the % uncertainty (3%) is given correct to 1 significant figure.
Therefore the correct answer should be to the nearest tenth which results in C = 330 m/s
Hope you understood what I am trying to say :)
ashwinkandel:
you are great deadly_king. thanks again .
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version