Question

Assertion: Splitting of the spectral lines in the presence of a magnetic field is known as the stark effect.
Reason: Line spectrum is simplest for hydrogen atoms.
A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
B. Both Assertion and Reason are correct but Reason is not the correct explanation or Assertion
C. Assertion is correct but Reason is incorrect
D. If Assertion is incorrect but Reason is correct

Answer 1

Hint: In this question, we have to first identify whether the statements given in the assertion and reason are true or not, if any of the statements is incorrect then two of the options will get removed automatically.

Complete answer:
The correct answer to this question is option D, the statement given in the assertion is false and the statement given in the reason is true.
Let us see first if the statement in the assertion is true or not. So, the statement in the assertion says that the effect of splitting spectral lines in the presence of a magnetic field is known as the stark effect.
But, this effect is not known as the stark effect, this effect is known as the Zeeman effect. The Zeeman effect is an effect where spectral lines are split in the presence of a static magnetic field.
The Zeeman effect is analogous to the stark effect, which is an effect where the spectral lines are split into different components in the presence of an electric field. The Zeeman effect is named after a Dutch physicist named Pieter Zeeman.
Thus, the statement given in the assertion is not true or it is incorrect.
Now, the statement in the reason says that the line spectrum is simplest for hydrogen atoms. The statement given in the reason is true as an atom of hydrogen only contains one electron. Due to this, the absorption and emission spectrum of hydrogen becomes easy to determine.
So, the statement given in the reason is true or correct. Therefore, the correct option is option D, assertion is incorrect but reason is correct.

Note:
The line spectrum of any atom can be found out by subjecting it to photons, then the electron will take its energy and move to a higher energy orbit. When it comes back to its original orbit automatically, it will shoot a photon and that will give the line spectrum of an element.