A: According to Bohr's atomic model the ratio of angular momenta of an electron in first excited state and in ground state is `2:1`.
In a Bohr's atom the angular momentum of the electron is directly proportional to the principal quantum number.

Options

A. If both Assertion & Reason are true and the reason is the correct explantion of the assertion , then mark (1)
B. if both Assertion & Reason are true but the reason is not the correct explantion of the assertion , then mark (2)
C. If Assertion is true statement but Reason is false, then mark (3)
D. If both Assertion and Reason are false statements, then mark (4)

Answer

A