The Ratio of intensities of the D1 and D2 lines of sodium at high temperature is?
a) 1:1
b)2:3
c)1:3
d)1:2

Question

The Ratio of intensities of the D1 and D2 lines of sodium at high temperature is?
a) 1:1
b)2:3
c)1:3
d)1:2

ujjwal · Answer

Measurements of the intensity ratio of the 589.0/589.6 nm sodium doublet in the terrestrial nightglow over an 8-year period, involving >300 separate determinations, have established that it is variable, the value RD = I(D2)/I(D1) lying between 1.2 and 1.8.

So, it seems to be (b)2:3..

Note: I have copied and pasted the above answer.

anonymous · Answer

how do u calculate 1.2 and 1.8?

ujjwal · Answer

I didn't calculate it. I just copied and pasted to help you. you would better read the PDF attachment.

anonymous · Answer

its a experimental approach buddy, its a paper .... and i want theory