23. Electromagnetic radiation of an unknown wavelength knocks electrons out of a Copper cath- ode of work function 4.70 eV. The stopping potential is 3.62 V. What is the wavelength of this electromagnetic radiation? a) 149 nm b) 229 nm c) 264 nm d) 1.15 x 10 nm e) 343 nm

23. Electromagnetic radiation of an unknown wavelength knocks electrons out of a Copper cath- ode of work function 4.70 eV. The stopping potential is 3.62 V. What is the wavelength of this electromagnetic radiation? a) 149 nm b) 229 nm c) 264 nm d) 1.15 x 10 nm e) 343 nm

Inquiry into Physics

8th Edition

ISBN:9781337515863

Author:Ostdiek

Publisher:Ostdiek

Chapter10: Atomic Physics

Section: Chapter Questions

Problem 8P

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Concept explainers

Compton effect

The incoming photons' energy must be in the range of an X-ray frequency to generate the Compton effect. The electron does not lose enough energy that reduces the wavelength of scattered photons towards the visible spectrum. As a result, with visible lights, the Compton effect is missing.

Recoil Velocity

The amount of backward thrust or force experienced by a person when he/she shoots a gun in the forward direction is called recoil velocity. This phenomenon always follows the law of conservation of linear momentum.

Question

23. Electromagnetic radiation of an unknown wavelength knocks clectrons out of a Copper cath-
ode of work function 4.70 eV. The stopping potential is 3.62 V. What is the wavelength of
this electromagnetic radiation?
a) 149 nm
b) 229 nm
c) 264 nm
d) 1.15 x 10 nm
e) 343 nm

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