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Photoelectric Effect

Q. The work function of an element is the energy required to remove an electron from the surface of the solid element. The work function for lithium is 279.7 kJ/mol (that is, it takes 279.7 kJ of energy to remove one mole of electrons from one mole of Li atoms on the surface of Li metal). What is the maximum wavelength of light that can remove an electron from an atom on the surface of lithium metal?

Solved • Sep 19, 2019

Photoelectric Effect

Q. Light of three different wavelengths- 325 nm, 455 nm, and 632 nm - is shined on a metal surface. The observations for each wavelength, labeled A, B, and C, is as folllows: Observation A: No photoelectrons were observed. Observation B: Photoelectrons with a kinetic energy of 155 kJ/mol were observed Observation C: Photoelectrons with a kinetic energy of 51 kJ/mol were observed Which observation corresponds to which wavelength of light? Drag the terms on the left to the appropriate blanks on the right to complete the sentences.

Solved • Aug 28, 2019

Photoelectric Effect

Q. A silicon (Φ = 7.77 × 10-19 J) surface is irradiated with UV radiation with a wavelength of 225 nm. Assume an electron was a mass of 9.11 x 10-31 kg. What is the frequency of the incident radiation? What is the kinetic energy of the emitted electrons? What is the speed of the emitted electrons? What is the wavelength of the emitted electrons?

Solved • Jul 3, 2019

Photoelectric Effect

Q. The minimum energy needed to remove an electron from potassium metal is 3.7 × 10–19 J. Will photons of frequencies 4.3 × 10 14 Hz (red light) and 7.5 × 10 14 Hz (blue light) trigger the photoelectric effect?

Solved • May 14, 2019

Photoelectric Effect

Q. How does the particle theory explain the photoelectric effect while the wave theory does not?

Solved • May 14, 2019

Photoelectric Effect

Q. A metal with a threshold frequency of 1.33×1015 s−1 emits an electron with a velocity of 6.45×105 m/s when radiation of 1.59×1015 s−1 strikes the metal.Calculate the mass of the electron.

Solved • May 9, 2019