Question

why are multiples and sub multiple of s.I unit used​

Answer 1

Answer:

Young's modulus, Y=

A

F

×

L

ΔL

As the both ΔL and L have same unit i.e. unit of length, so the term

L

ΔL

will be unit-less.

Thus, unit of Young's modulus becomes unit of force divided by unit of area.

Therefore, CGS unit of Y is dyne/cm

2

and MKS unit of it is N/m

2

.

Thus, 1dyne/cm

2

=

(10

−2

)

2

m

2

10

−5

N

=0.1N

(note : 1N=10

5

dyne)