B because usually Asians have round hair shafts , because Caucasians have oval hair shafts
<span>The top benefit of pesticides is their effectiveness against pests that would otherwise decimate crops large and small. </span>
Why do chemical reactions always involve a change in energy?
The energy change in a chemical reaction is due to the difference in the amounts of stored chemical energy between the products and the reactants. This stored chemical energy, or heat content, of the system is known as its enthalpy.
Electromagnetic waves can travel in vaccum but mechanical wave does not
There are four options in the question. We are asked to calculate the correct option which is similar to both Bohr's and Rutherford's atomic model.
The first option is wrong. It is so because energy value of an electron in a particular orbit was assigned by Bohr. Rutherford's atomic model simply tells about the motion of electrons in various orbits around the nucleus which was also corrected by Bohr.
The second option is also wrong. Bohr had not described electronic positioning through electron cloud model.
As per Bohr's theory an electron will absorb energy when it will jump from ground state to excited state. The electron will emit energy when it will jump from excited state to ground state. Rutherford's theory had not described the gain and loss of energy of electrons .So this option is also wrong.
Both the theories have similarity in one aspect.Both the theories described the nucleus surrounded by large volume of space. There are two parts inside an atom .One is called nuclear part which contains protons and neutrons, and the second one is called extra nuclear part which contains electrons in various orbits. Most of the space in extra nuclear part is empty.
Hence option D is the correct answer.