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JEE Main201911 Jan 2019Morning ShiftChemistryStructure of AtomActual

Heat treatment of muscular pain involves radiation of wavelength of about 900 nm . Which spectral line of H atom is suitable for this purpose? [ R _ H =1 10⁵ ~cm ⁻¹ h =6.6 10⁻³⁴ Js , c =3 10⁸ ~ms ⁻¹ ]

Options

  1. APaschen, 3
  2. BPaschen, 5 3
  3. CBalmer, 2
  4. DLyman, 1

Correct answer

A. Paschen, 3

Step-by-step solution

1 = R ( 1 n₁² - 1 n₂² )n₁=3, n₂= 1 = R ( 1 9 ) = 9 R = 9 10⁵ =9 10⁻⁵ ~cm =900 nm

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