499.0 seconds, light travels at a speed of 299,792 kilometers per second; 186.287 miles per second.
Answer:
When atoms are excited they emit light of certain wavelengths which correspond to different colors. Each element produces a unique set of spectral lines. Since no two elements emit the same spectral lines, elements can be identified by their line spectrum.
Explanation:
As we know that there are avogadro no. of atoms in 9 g of beryllium.
1 mole of beryllium = 6.02 * 10^23 atoms
so 2.5 mole= 6.02*10^23*2.5 i.e = <span>15.055 × 10^23 atoms </span>
Suspension mixture was their dinner if they were having spaghetti and meatballs. The right option is D.
Explanation:
Properties of suspension mixture are:
Bigger particles are seen in suspension, and they are visible by naked eye.
Suspension is a heterogenous mixture of either two or more substances.
Solute particles are not dissolved in solvent instead they are suspended as it is or in bulk.
Exhibits Tyndall effect.
Solid particles get sedimented easily.
A mixture of spaghetti and meatballs are suspension because two paricles are not dissoved, and they have separate phases on sphagetti and meat ball where liquid in meat ball drizzles to bottom and meatball remians on top.
