Activity: Solve the following problems. Use the rubrics as your guide in presenting your solution (refer to attachment A.1 at the next page). 1. In the photoelectric effect, it is found that incident photons with energy 5.00 eV will produce electrons with a maximum kinetic energy 3.00 eV. What is the threshold frequency of this material?

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Example:
Light of frequency of 1.00 x 10¹5 Hz illuminates a sodium surface. The ejected photoelectrons are found to have
a maximum kinetic energy of 1.78 eV. Find the threshold frequency for this metal.
Given:
Solution:
KEmax = (1.78 eV)(1.60 x 10-19 J/eV)
KEmax hf - hft ; ft=
=
= 2.85 x 10-1⁹ J
hf-KEmax
h
(6.63 x 10-34 Js) (1.00 x 10¹5 Hz)-(2.85 x 10-¹⁹ J)
6.63 x 10-34 Js
f= 1.00 x 1015 Hz
f₁= 5.70 X 1014 Hz
Activity:
Solve the following problems. Use the rubrics as your guide in presenting your solution (refer to attachment A.1
at the next page).
1. In the photoelectric effect, it is found that incident photons with energy 5.00 eV will produce electrons
with a maximum kinetic energy 3.00 eV. What is the threshold frequency of this material?
Transcribed Image Text:Example: Light of frequency of 1.00 x 10¹5 Hz illuminates a sodium surface. The ejected photoelectrons are found to have a maximum kinetic energy of 1.78 eV. Find the threshold frequency for this metal. Given: Solution: KEmax = (1.78 eV)(1.60 x 10-19 J/eV) KEmax hf - hft ; ft= = = 2.85 x 10-1⁹ J hf-KEmax h (6.63 x 10-34 Js) (1.00 x 10¹5 Hz)-(2.85 x 10-¹⁹ J) 6.63 x 10-34 Js f= 1.00 x 1015 Hz f₁= 5.70 X 1014 Hz Activity: Solve the following problems. Use the rubrics as your guide in presenting your solution (refer to attachment A.1 at the next page). 1. In the photoelectric effect, it is found that incident photons with energy 5.00 eV will produce electrons with a maximum kinetic energy 3.00 eV. What is the threshold frequency of this material?
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