Fossils are the written document of evolution.
How can we calculate the age of fossil?

Fossils are the written document of evolution. Name the branch of biology which deals with study of fossils?

Manufacturing of iron: How can we change iron into steel?

Density of a unit cell is the same as the density of the substance. So, if the density of the substance is known, we can calculate the number of atoms or dimensions of the unit cell. The density of the unit cell is related to its formula mass (M), number of atoms per unit cell (z), edge length (a in cm), and Avogadro's constant N_(A) , as rho=(zxxM)/(a^(3)xxN_(A)) Q. An element X crystallizes in a structure having an fcc unit cell of an edge 100 pm. if 24 g of the element contains 24xx10^(23) atoms, the density is

Density of a unit cell is the same as the density of the substance. So, if the density of the substance is known, we can calculate the number of atoms or dimensions of the unit cell. The density of the unit cell is related to its formula mass (M), number of atoms per unit cell (z), edge length (a in cm), and Avogadro's constant N_(A) , as rho=(zxxM)/(a^(3)xxN_(A)) Q. A metal A (atomic mass=60) has a body-centred cubic crystal structure. the density of the metal is 4.2 g cm^(-3) . the volume of unit cell is

(i) If the mass of a coin 5g, then what will be the mass of thousand coins. (ii) if the mass of coin in the bag is 50,000g, then how many coins will be there? (iii)Like this we can calculate the number of coins on the basis of mass. Can't we?

The numbers 1,4, 8 on a clock’s face are joined to make a triangle. Calculate the angles of this triangle. How many equilateral triangles can we make by joining numbers on the clock’s face?