engineering chemistry MCQ #968

The frequency of a spectral line is given by ν = Rc (1/n1² - 1/n2²). For Hα line, n1 = 2, n2 = 3. ν will be

engineering chemistry MCQ #968

  1. Question 1

    Q1. The frequency of a spectral line is given by ν = Rc (1/n1² - 1/n2²). For Hα line, n1 = 2, n2 = 3. ν will be

    • A) 4.57 x 10¹⁴ Hz
    • B) 3.29 x 10¹⁵ Hz
    • C) 1.89 x 10¹⁴ Hz
    • D) 6.17 x 10¹⁴ Hz

    Answer: 4.57 x 10¹⁴ Hz

    Explanation: Substitute n1 = 2, n2 = 3 into ν = Rc (1/4 - 1/9) = Rc (5/36). Using Rc = 3.29 x 10¹⁵ Hz, ν = 4.57 x 10¹⁴ Hz.