The longest wavelength of light that causes electrons to be ejected from the surface of a copper plate is 243 nm. What is the maximum velocity of the electrons ejected when light of wavelength 200. nm shines on a copper plate A) 1.97 * 10⁴ m/s B) 4.67 * 10⁴ m/s C) 6.22 * 10⁵ m/s D) 1.34 * 10⁶ m/s E) 1.48 * 10⁶ m/s

Question

Quizplus · Accepted Answer

The energy of the incident light (200 nm) is greater than the threshold energy (243 nm), resulting in excess energy that converts to kinetic energy of the ejected electrons. Using the photoelectric equation and solving for velocity, the maximum velocity is approximately 6.22 * 10^5 m/s.

The Longest Wavelength of Light That Causes Electrons to Be