14. The work function for platinum is 6.35 eV. UltravioletGP light of wavelength 150 nm is incident on the clean sur-Q C face of a platinum sample. We wish to predict the stop-ping voltage we will need for electrons ejected from thesurface. (a) What is the photon energy of the ultravio-let light? (b) How do you know that these photons willeject electrons from platinum? (c) What is theimum kinetic energy of the ejected photoelectrons?(d) What stopping voltage would be required to arrest thecurrent of photoelectrons ?max-

Question
Asked Nov 10, 2019

need help with b-d

14. The work function for platinum is 6.35 eV. Ultraviolet
GP light of wavelength 150 nm is incident on the clean sur-
Q C face of a platinum sample. We wish to predict the stop-
ping voltage we will need for electrons ejected from the
surface. (a) What is the photon energy of the ultravio-
let light? (b) How do you know that these photons will
eject electrons from platinum? (c) What is the
imum kinetic energy of the ejected photoelectrons?
(d) What stopping voltage would be required to arrest the
current of photoelectrons ?
max-
help_outline

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14. The work function for platinum is 6.35 eV. Ultraviolet GP light of wavelength 150 nm is incident on the clean sur- Q C face of a platinum sample. We wish to predict the stop- ping voltage we will need for electrons ejected from the surface. (a) What is the photon energy of the ultravio- let light? (b) How do you know that these photons will eject electrons from platinum? (c) What is the imum kinetic energy of the ejected photoelectrons? (d) What stopping voltage would be required to arrest the current of photoelectrons ? max-

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check_circleExpert Solution
Step 1

Given,

Work Function W = 6.35 eV
6.35x1.6x109 J
10.16x1019
Wavelength A 150 nm 150 x 10
m
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Work Function W = 6.35 eV 6.35x1.6x109 J 10.16x1019 Wavelength A 150 nm 150 x 10 m

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Step 2

Part (b):

In Photoelectric effect, When the light is fall on the metal surface then the electrons are ejected from the metal surface. Due to these ejected electrons, current varies and show a deflection in ammeter.  

Step 3

Part (d): Stopping Voltag...

КЕ.
max
V =-
е
Е-W
е
hc
-W
е
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КЕ. max V =- е Е-W е hc -W е

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