Sarthaks Test
+1 vote
19.1k views
in Chemistry by (2.8k points)

A. 1+2+3......(x+1)

B. 1+2+3......(x2)

C. 1+2+3......(×-1)

D. (×+1)(×+2)(×+4)

Please log in or register to answer this question.

1 Answer

+1 vote
by (15.1k points)

The correct answer will be option (C) i.e 1+2+3......(×-1)

Explanation:

Thus the number of lines emitted from nth energy level

= 1 + 2 + 3 +………… n – 1 = ∑(n – 1)

∑n =  n(n+1)/2      

Thus, ∑ (n – 1) = ( n-1) (n-1+1)/2  = (n-1) (n)/2 

Number of spectral lines that appear in spectrum when an electron jumps from nth energy level = n (n-1)/2

Welcome to Sarthaks eConnect: A unique platform where students can interact with teachers/experts/students to get solutions to their queries. Students (upto class 10+2) preparing for All Government Exams, CBSE Board Exam, ICSE Board Exam, State Board Exam, JEE (Mains+Advance) and NEET can ask questions from any subject and get quick answers by subject teachers/ experts/mentors/students.

Categories

...