(6%) Problem 5: In a photoelectric effect experiment you illuminate a metal with light of an unknown wavelength and measure themaximum kinetic energy of the photoelectrons to be 0.65 eV. Then you illuminate the same metal with light of a wavelength known tobe 2/3 of the first wavelength and measure a maximum kinetic energy of 2.2 eV for the photoelectrons.50% Part (a) Find the first wavelength, in nanometersGrade SamaDeductionsPotentialSabmbsions79tan)cos0sin)Attempts rem(55% per atterdetailed vie4E56acos0asin)cotan)31sinh)acotan)atan00cotanh)tanh0cosh)NODegreesRadiansI give up!HintSubmitFeedback: 0 deductioe per feedbackdeduction per hint Hints remainingHints: 0& 50% Part (b) Find the metal's work function, in electron volts.

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Asked Nov 18, 2019
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(6%) Problem 5: In a photoelectric effect experiment you illuminate a metal with light of an unknown wavelength and measure the
maximum kinetic energy of the photoelectrons to be 0.65 eV. Then you illuminate the same metal with light of a wavelength known to
be 2/3 of the first wavelength and measure a maximum kinetic energy of 2.2 eV for the photoelectrons.
50% Part (a) Find the first wavelength, in nanometers
Grade Sama
Deductions
Potential
Sabmbsions
7
9
tan)
cos0
sin)
Attempts rem
(55% per atter
detailed vie
4
E
5
6
acos0
asin)
cotan)
3
1
sinh)
acotan)
atan0
0
cotanh)
tanh0
cosh)
NO
DegreesRadians
I give up!
Hint
Submit
Feedback: 0 deductioe per feedback
deduction per hint Hints remaining
Hints: 0
& 50% Part (b) Find the metal's work function, in electron volts.
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(6%) Problem 5: In a photoelectric effect experiment you illuminate a metal with light of an unknown wavelength and measure the maximum kinetic energy of the photoelectrons to be 0.65 eV. Then you illuminate the same metal with light of a wavelength known to be 2/3 of the first wavelength and measure a maximum kinetic energy of 2.2 eV for the photoelectrons. 50% Part (a) Find the first wavelength, in nanometers Grade Sama Deductions Potential Sabmbsions 7 9 tan) cos0 sin) Attempts rem (55% per atter detailed vie 4 E 5 6 acos0 asin) cotan) 3 1 sinh) acotan) atan0 0 cotanh) tanh0 cosh) NO DegreesRadians I give up! Hint Submit Feedback: 0 deductioe per feedback deduction per hint Hints remaining Hints: 0 & 50% Part (b) Find the metal's work function, in electron volts.

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Expert Answer

Step 1

Einstein’s photoelectric equation is,

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hc max hc = +0.65 eV.. ..I)

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Step 2

When the wavelength is 2/3rd of first wavelength,

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hc =4 2.2 eV 2 (ई) Зhс = 4 +2.2 e. 22 ....I)

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Step 3

Subtract equation (I) fr...

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3hc hc = % + 2.2 eV - ( 0.65 eV) 22 hc 1.55 eV (6.626 10J-s) (3x 10 m/s) 1.6x10J 1.55 eV leV 1nm 8.01x10 m 10 m 801 nm

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