JEE PYQ: Atomic Structure Question 42
Question 42 - 2019 (11 Jan Shift 1)
Heat treatment of muscular pain involves radiation of wavelength of about 900 nm. Which spectral line of H-atom is suitable?
(1). (Paschen, $\infty \to 3$)
(2). (Paschen, $5 \to 3$)
(3). (Balmer, $\infty \to 2$)
(4). (Lyman, $\infty \to 1$)
Show Answer
Answer: (1)
Solution
$\lambda = \frac{9}{R_H} = \frac{9}{10^5}$ cm $= 900$ nm. This corresponds to Paschen series limit ($\infty \to 3$).
BETA
