Question

which is not a dimensionless quantity a)strain b)solid angle c) dielectric constant d )plancks constant​

Answer 1

plancks constant is dimension less quantity...

Dimensional Formula of Planck's constant = M1L2T-1. SI unit of Planck's constant is joule-seconds (j-s).

Answer 2

(D) Planck's constant is not a diemsionless quantity.

• Stain : Strain is the ratio of this change in length of the body to the original lenght. That is strain =change in length/original length. Hence both numerator and denominator have same dimension (lenghth), the strain is dimension less.

•Solid angle : Solid angle also is dimensionless.But it has units like Steradian.

•Dielectric Constant: Dielectric constant is the division of two physical quantity with same dimension.So , it is dimensionless.

•Planck's Constant : Planck's Constant (h) = Energy(E) / frequency (ν). Putting these values in above equation we get, Dimensional Formula of Planck's constant = M1L2T-1.