Question

The density of a material in CGS system of units is 4 g cm^-3. In a system of units in which unit of length is 10 cm and unit of mass is 100 g, the value of density of material will be

• A. 0.04
• B. 0.4
• C. 40
• D. 400

Answer 1

Answer: (C)

40

Answer 2

As $n_{1}u_{1} = n_{2}u_{2}$

$4\frac{g}{cm^{3}} = n_{2}\frac{100g}{(10cm)^{3}} \Rightarrow n_{2} = 40$