Secure https/wwww webassign net/web/studentAssignment Responsessubmit?deps157201

Question

Secure https/wwww webassign net/web/studentAssignment Responsessubmit?deps15720144 PRACTICE IT A sodium surface is aluminated with light Use the worked example above to help you solve this problem wavelength 0.332 m. The work function for sodium is 2A6 ev (a) Calculate the energy of each photon in electron volts. (b) calculate the maximum kinetic energy of the ejected photoelectrons. Calculate the cutoff wavelength for sodium. (c S: GETTING STARTED EXERCISE ight will eject photons from a copper surface? (a) What minimum frequency what is the relationship between the work function and the cutoff frequency? Hz in ev) of the resulting If this frequency is multiplied by 2.9, find the maximum kinetic energy

Explanation / Answer

a] Minimum frequency = E/h

where E is the work function of the metal

E = 2.46 eV = 2.46 x 1.6 x 10-19 J

so, v = E/h = 5.94 x 1014 Hz

b] v' = 2.9v = 2.9 x 5.94 x 1014 Hz

so, energy of this photon will be: E' = hv' = 6.626 x 10-34 x 2.9 x 5.94 x 1014 = 1.14144 x 10-18 J = 7.134 eV

and Work Function = 2.46 eV

therefore, the kinetic energy of the ejected electrons = 7.134 - 2.46 = 4.674 eV.

Related Questions

Navigate

• Browse (All)
• Browse S
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.