Photons

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a) The energy required to remove an electron from sodium is 2.3 eV. Does sodium show a photoelectric effect
for the yellow light, with *λ* = 5890 Å?

b) What is the cutoff wavelength for photoelectric emission from sodium?

Given: speed of light,*c* = 2.998×10^{8} m/s, *Planck constant*,
*h* = 6.626×10^{−34} J.s, and 1 eV = 1.602×10^{−19} J.

b) What is the cutoff wavelength for photoelectric emission from sodium?

Given: speed of light,

Light of wavelength 2000 Å falls on an aluminum surface. In aluminum 4.2 eV are required to remove
an electron. What is the kinetic energy of

a) the fastest and

b) the slowest emitted photoelectrons;

c) What is the stopping potential?

d) What is the cutoff wavelength for aluminum?

e) If the intensity of the incident light is 2.0 W/m^{2}, what is the average number of photons
per unit time per unit area that strike the surface?

f) If the incident light intensity is doubled, what is the maximum energy value of the removed electrons?

Given: speed of light,*c* = 2.998×10^{8} m/s, *Planck constant*,
*h* = 6.626×10^{&mminus;34} J.s, and 1 eV = 1.602×10^{−19} J.

a) the fastest and

b) the slowest emitted photoelectrons;

c) What is the stopping potential?

d) What is the cutoff wavelength for aluminum?

e) If the intensity of the incident light is 2.0 W/m

f) If the incident light intensity is doubled, what is the maximum energy value of the removed electrons?

Given: speed of light,

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Fisicaexe - Physics Solved Problems by Elcio Brandani Mondadori is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License .