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CBSE Class 11-science Answered

In the relation y=a cos(wt-kx), the dimensional formula for k is

Asked by Anil | 10 May, 2017, 08:54: PM
answered-by-expert Expert Answer
The dimensional formula for 'k' can be obtained in two ways.
First method:
As (ωt - kx) is an angle, it has to be dimensionless. So, kx should be dimensionless.
Hence, the dimensions of k = 1/dimensions of x
 
Therefore, [k] = L-1
 
Second method: Dimension of ωt = dimension of kx
begin mathsize 12px style therefore straight k equals ωt over straight x equals fraction numerator straight T to the power of negative 1 end exponent straight T over denominator straight L end fraction equals straight L to the power of negative 1 end exponent end style
Answered by Romal Bhansali | 11 May, 2017, 02:39: PM

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