been defined in such a way. It is defined as the numbers of particles in 12 g of 12C. If it were 24 g instead of 12 g, then the weight of 1 mole of substance would equal 2 times the atomic/molecular mass in grams.
Explanation: This is because radio waves are the longest and gamma rays are the shortest wavelengths. Visible light is in between infrared and ultraviolet rays.
