Newschool of Architecture and Design Week 9 Photoelectric Effect Questions

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ancylba111

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NewSchool of Architecture and Design

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as usual but this time I have test instead of quiz

HW-9 is attached

QUIZ-9 is on blackboard

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HW Week 9 Name___________________ Photoelectric Effect 1) Write down the equation which relates the energy of a photon to its frequency 2) Write down the equation which relates the wavelength of a light photon to its frequency 3) What is the energy of a photon with a frequency of 1.5 x 1014Hz? 4) What is the energy of a photon of red light whose wavelength is 700nm? 5) A photon can give an electron the energy necessary just to escape the surface of a metal. This exact amount of energy is called the ________ function of the metal. 6) The diagram shows an electron A at the surface of a piece of zinc. A photon p is striking the electron. What will happen to the electron if the energy of the photon is: a) less than the work function of the metal b) Exactly equal to the work function of the metal c) Greater than the work function of the metal p -A Zinc surface B 7. Photons of equal energy strike electron A, at the surface of the metal and electron B just below the surface of the metal. Both electrons are ejected. Which ejected electron will have the greater kinetic energy? Why? 8) Use the relationship to solve: photon energy = energy needed to escape metal surface + KE of ejected electron A photon with an energy of 5 x 10-23 J strikes a metal surface and causes an surface electron to be ejected.. The work function of the metal is 3.4 x 10-23J. What is the maximum kinetic energy that the ejected electron can have? Nuclear Equations Worksheet Complete the following nuclear equations 1. 210 84 2. 8 5 Po → _______ + 24 He B → 48 Be + _______ 3. _______ → 234 91 Pa + −10 e +  C → _______ + −10 e 14 6 4. 5. ______ + 3781Rb → 3681Kr + X-ray photon 6. 158 O → 157 N + ______ Ni + −10 e → _______ 7. 58 28 8. 226 88 Ra → 222 86 Rn + ______ +  n → _____ + −10 e 9* 1 0 10. 238 92 U → _______ + 24 He 11. 49 Be + 24 He → _____ + 01n 12. ______ → Cu → 13. 66 29 14. 27 13 15. 141 56 66 30 239 94 Pu + −10 e Zn + ______ 30 Al + ______ → 14 Si + 11H Ba → ______ + −10 e 16. ______ + 24 He → 178 O + 11 p 4 17. ______ → 181 77 Ir + 2 He 18. 241 95 Am → _____ + 237 93 Np 19. ______ + 126 C → Cf +  n 246 98 20. 189 F → 178 O + _____ H + _____ → 24 He + 01n + energy 21. 2 1 22. 27 14 Si → 0 −1 e + ______ 23. ______ → 24 He + 21081Tl P → ______ + −10 e 24. 32 15 25. 142 61 26. 14 7 27. 13 6 28. 239 94 Pm + _____ → 142 60 Nd N + _____ → 146 C + 11 p C + 01n → ______ Pu + 24 He → 11H + 2 01n + ______
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HW Week 9

Name___________________

Photoelectric Effect
1) Write down the equation which relates the energy of a photon to its
frequency
Energy of one quanta is given by
E = hν
Where E is the energy of photon and h is the Planck's constant. h = 6.625*10^(-34) J-sec
ν is the frequency of photon

E = C/λ
2) Write down the equation which relates the wavelength of a light photon to its
frequency
Frequency of light is related to its wavelength is
V=C/λ
Where C is the velocity of light

C=v*λ

3) What is the energy of a photon with a frequency of 1.5 x 1014Hz?
E = 6.625*10^(-34) J-sec * 1.5 * 10 ^14 = 9.94×10^-11 J
4) What is the energy of a photon of red light whose wavelength is 700nm?

5) A photon can give an electron the energy ne...


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