The rate of decay of the mass of a radioactive substance at any time is `10^-4` times its mass at that instant. After 10,000 years, show that the mass will be less than half of original mass.

The decay constant of a radioactive element is 3 xx 10^(-6) min^- .Its half life is

The rate of disintegration of a radioactive element at any time t is proportional to its mass at that time.Find the time during which the original mass of 1.5 gm will disintegrate into its mass of 0.5 gm.

The mass of a single molecule of a substance is 8.5 xx 10^-23 gram. The molecular mass of the substance is

Solve the following examples/numerical problems : If the mass of a planet is eight times the mass of the earth and its radius is twice the radius of the earth, what will be the ratio of the escape velocity on the earth to the escape velocity on the planet?

If mass of planet is eight times the mass of the earth and its radius is twice the radius of the earth, what will be the escape velocity for that planet?

Mass of living matter at a trophic level in an area at any time is called.

If a body of mass 10 kg is taken to the centre of the earth, its weight will be

The mass of an atom of oxygen is 26.569 xx 10^-24 g. The atomic mass of oxygen in u is

Identify the CORRECT statements. The mass of one mole of a substance in grams is called its molar mass. The formula mass of a substance is the sum of atomic masses of atoms present in the formula. One mole is the amount of a substance that contains as many entities or particles as there are atoms in exactly 12 g of the carbon-10 isotope.