STANDARD Physics Work Function MCQ Question
What is the work function of the metal if the light of wavelength 4000 Å generates photoelectrons of velocity 6 × 10⁵ m s⁻¹ from it? (Mass of electron = 9 × 10⁻³¹ kg, Velocity of light = 3 × 10⁸ m s⁻¹, Planck’s constant = 6.626 × 10⁻³⁴ Js, Charge of electron = 1.6 × 10⁻¹⁹ J eV⁻¹)
4.0 eV
2.1 eV
0.9 eV
3.1 eV
Correct Answer
Detailed Explanation
The work function is calculated using the photoelectric equation: hν = W₀ + ½mv². Substituting the given values, we find W₀ ≈ 2.1 eV.
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