Q31.The ionization energy of gaseous Na atoms is 495. 5 kJ mol−1 . The lowest possible frequency of light that ionizes a sodium atom is (h = 6.626 × 10−34 Js, NA= 6.022 × 1023 mol−1) (1) 1.24 × 1015 s−1 (2) 7.50 × 104 s−1 (3) 4.76 × 1014 s−1 (4) 3.15 × 1015 s−1
What This Question Tests
This question involves calculating the minimum frequency of light required to ionize a sodium atom, connecting ionization energy per mole to energy per atom and photon energy.
Concepts Tested
Formulas Used
E = hν
Ionization Energy (per atom) = Ionization Energy (per mole) / N_A
📚 NCERT Sections This Tests
12.5 — A Hydrogen Atom Initially In The Ground Level Absorbs A Photon,
Physics Class 12 · Chapter 12
12.5 A hydrogen atom initially in the ground level absorbs a photon, which excites it to the n = 4 level. Determine the wavelength and frequency of photon.
12.3 — A Difference Of 2.3 Ev Separates Two Energy Levels In An Atom. What
Physics Class 12 · Chapter 12
12.3 A difference of 2.3 eV separates two energy levels in an atom. What is the frequency of radiation emitted when the atom make a transition from the upper level to the lower level?
11.6 — The Threshold Frequency For A Certain Metal Is 3.3 × 1014 Hz. If Light
Physics Class 12 · Chapter 11
11.6 The threshold frequency for a certain metal is 3.3 × 1014 Hz. If light of frequency 8.2 × 1014 Hz is incident on the metal, predict the cut- off voltage for the photoelectric emission.
📋 Question Details
- Chapter
- Atomic Structure
- Topic
- Photoelectric effect, Ionization energy
- Year
- 2014
- Shift
- 19 Apr Online
- Q Number
- Q31
- Type
- MCQ
- NCERT Ref
- Class 11 Chemistry Ch 2: Structure of Atom
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