- Defination of primary and secondary standard substance?

Discover Questions

The middle term of (y^2 - 1/2)^8 is 35y^8/4. Is this true or false? If antenna is fed with pulsed DC instead of AC at its resonant frequency, how efficient will it be? An ionic compound has the formula X3Y2. To which groups of periodic table do X and Y belong? Find the value of B given that Z1 + 4z2 = A + JB z1 = 3 - 5j
z2 = 5 - 3j? If f(x) is differentiable for all of x find the value of a and b : f(x)=cos (x) if x<0 =ax+b If x>or equal to zero?