AP EAMCET201920 Apr 2019Evening ShiftChemistryStructure of AtomActual
When a certain metal was irradiated with light of frequency 4.0 10¹⁶ ~s ⁻¹ , the photoelectrons emitted had four times kinetic energy as the kinetic energy of photoelectrons emitted when the same metal was irradiated with light of frequency 2.0 10¹⁶ ~s ⁻¹ . The threshold frequency (v₀ ) of the metal in s ⁻¹ is
Options
- A2 10¹⁶
- B4 10¹⁶
- C2.5 10¹⁶
- D1.33 10¹⁶
Correct answer
D. 1.33 10¹⁶
Step-by-step solution
Given, aligned v₁ & =4 10¹⁶ sec ⁻¹ v₂ & =2 10¹⁶ sec ⁻¹ KE ₁ & =4 KE ₂ aligned From equation of photoelectric effect, On putting the above calculated value in eq (ii), we get gathered 2 h v₂ 3 =h v₀ 2 h 2 10¹⁶ 3 =h v₀ v₀=1.33 10¹⁶ gathered