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 = 2.998×10⁸ m/s, Planck constant, h = 6.626×10⁻³⁴ J.s, and 1 eV = 1.602×10⁻¹⁹ J.

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/m², 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 = 2.998×10⁸ m/s, Planck constant, h = 6.626×10^&mminus;34 J.s, and 1 eV = 1.602×10⁻¹⁹ J.