Q47.The work function of sodium metal is 4. 41 × 10−19J. If photons of wavelength 300 nm are incident on the metal, the kinetics energy of the ejected electrons will be (h = 6. 63 × 10−34J s; c = 3 × 108 m s−1) __________ ×10−21J
What This Question Tests
This question requires a direct application of the photoelectric effect equation, where the energy of the incident photon is calculated from its wavelength and then used with the given work function to find the maximum kinetic energy of the ejected electrons.
Concepts Tested
Formulas Used
KE_max = E_photon - Φ
E_photon = hc/λ
📚 NCERT Sections This Tests
11.7 — The Work Function For A Certain Metal Is 4.2 Ev. Will This Metal Give
Physics Class 12 · Chapter 11
11.7 The work function for a certain metal is 4.2 eV. Will this metal give hotoelectric emission for incident radiation of wavelength 330 nm?
11.2 — The Work Function Of Caesium Metal Is 2.14 Ev. When Light Of
Physics Class 12 · Chapter 11
11.2 The work function of caesium metal is 2.14 eV. When light of frequency 6 ×1014Hz is incident on the metal surface, photoemission of electrons occurs. What is the (a) maximum kinetic energy of the emitted electrons, (b) Stopping potential, and (c) maximum speed of the emitted photoelectrons?
11.9 — Light Of Wavelength 488 Nm Is Produced By An Argon Laser Which Is
Physics Class 12 · Chapter 11
11.9 Light of wavelength 488 nm is produced by an argon laser which is used in the photoelectric effect. When light from this spectral line is incident on the emitter, the stopping (cut-off) potential of photoelectrons is 0.38 V. Find the work function of the material from which the emitter is made.
📋 Question Details
- Chapter
- Atomic Structure
- Topic
- Photoelectric Effect
- Year
- 2020
- Shift
- 02 Sep Shift 2
- Q Number
- Q47
- Type
- Numerical
- NCERT Ref
- Class 11 Chemistry Ch 2: Atomic Structure
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