Question

Assertion: (A): The line spectrum of an element is known as finger prints of its atom.
Reason: (R): Each element has a unique line emission spectrum.

Answer 1

Here both assertion and reason are true and the reason is correct explanation of the assertion.

Each element has its own characteristic line spectrum  and thus it is called as finger print of its atom.

Answer 2

As we know that the Assertion and Reason  

Here both are true and the reason is correct explanation of the assertion.

In the given statement each element has its own characteristic line spectrum  and hence  it is called as finger print of its atom.