NEET2017Physics-Photoelectric Effect
NEET 2017 Physics Threshold Wavelength MCQ Question
Type: MCQ-numerical-Hard-Class 12
The photoelectric threshold wavelength of silver is 3250 x 10⁻¹⁰ m. The velocity of the electron ejected from a silver surface by ultraviolet light of wavelength 2536 x 10⁻¹⁰ m is: (Given: h = 4.14 x 10⁻¹⁵ eVs and c = 3 x 10⁸ m/s)
A
≈ 6 x 10⁵ m/s
B
≈ 0.6 x 10⁶ m/s
C
≈ 61 x 10³ m/s
D
≈ 0.3 x 10⁶ m/s
Correct Answer
Option A
Detailed Explanation
Using the photoelectric equation, the kinetic energy of the ejected electron can be calculated and then converted to velocity using KE = 1/2 mv².
Found an issue with this question?