alleryThe series of hydrogen lines lying entirely in the ultraviolet region is the:
- Lyman series
- Balmer series
- Paschen series
- Brackett series
Show answer and solution
Correct answer: A. Lyman series
Lyman series: transitions to n = 1, UV region.
NEET UG Modern Physics — practice questions
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The series of hydrogen lines lying entirely in the ultraviolet region is the:Read the answer and worked solution →The hydrogen series lying in the visible region is the:Read the answer and worked solution →The Rydberg formula for hydrogen lines is 1/λ = R(1/n₁² − 1/n₂²) where for the Balmer series n₁ equals:Read the answer and worked solution →The Rydberg constant R for hydrogen is approximately:Read the answer and worked solution →For hydrogen-like ions of atomic number Z, the energy of the n-th level is:Read the answer and worked solution →The orbital speed of the electron in the n-th Bohr orbit is proportional to:Read the answer and worked solution →The total energy of an electron in a Bohr orbit equals:Read the answer and worked solution →De Broglie supported Bohr's quantisation by suggesting that the electron orbit must contain an integer number of:Read the answer and worked solution →The angular momentum L of the electron in the n-th Bohr orbit is:Read the answer and worked solution →In the visible-region Balmer series, the longest-wavelength line corresponds to the transition:Read the answer and worked solution →In Bohr's model, an electron in a stationary orbit:Read the answer and worked solution →Bohr's model could explain the hydrogen spectrum but failed to:Read the answer and worked solution →The wavelength of a photon emitted when an electron in hydrogen jumps from n = 3 to n = 2 is approximately:Read the answer and worked solution →Number of spectral lines emitted when a hydrogen atom de-excites from n = 4 to n = 1 (all possible cascades) is:Read the answer and worked solution →The energy required to excite a hydrogen atom from the ground state to its first excited state (n = 1 to n = 2) is approximately:Read the answer and worked solution →In Bohr's model, the centripetal force on the electron is supplied by the:Read the answer and worked solution →The de Broglie wavelength of an electron in the n = 1 Bohr orbit of hydrogen equals the:Read the answer and worked solution →For the ground state of singly ionised helium (He⁺, Z = 2), the energy of the electron is:Read the answer and worked solution →Match each photoelectric termRead the answer and worked solution →True or false: modern physicsRead the answer and worked solution →
Worked practice questions
The hydrogen series lying in the visible region is the:
- Lyman
- Bracket
- Paschen
- Balmer
Show answer and solution
Correct answer: D. Balmer
Balmer series (transitions to n = 2) lies in visible region.
The Rydberg formula for hydrogen lines is 1/λ = R(1/n₁² − 1/n₂²) where for the Balmer series n₁ equals:
- 1
- 4
- 3
- 2
Show answer and solution
Correct answer: D. 2
Balmer series ends at n₁ = 2.
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