Chemistry Homework Help

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Photoelectric Effect

Q. A certain shade of blue has a frequency of 7.04 × 10 14 Hz. What is the energy of exactly one photon of this light?

Solved • Feb 20, 2020

Photoelectric Effect

Q. Here are some data collected on a sample of cesium exposed to various energies of light. Note that 1 eV (electron volt) = 1.60 x 10^-19 J. What is the threshold frequency v0 of cesium? Express your answer numerically in hertz.

Solved • Feb 8, 2020

Photoelectric Effect

Q. The energy required to ionize magnesium is 738 kJ/mol. What minimum frequency of light is required to ionize magnesium? Express the minimum frequency in inverse seconds to three significant figures.

Solved • Feb 8, 2020

Photoelectric Effect

Q. Use Planck's equation to calculate photon energy. (a) Calculate the energy of a single photon of light with a frequency of 1.19x10^12s^-1

Solved • Jan 27, 2020

Photoelectric Effect

Q. An x-ray photon with a wavelength of .978nm strikes a surface. The emitted electron has the kinetic energy of 974 eV. What is the binding energy of the electron in KJ/ mol. (Note that KE=.5mv^2 and 1 eV= 1.602*10^-19 J

Solved • Jan 20, 2020

Photoelectric Effect

Q. The half life of a positron is very short. It reacts with an electron and the masses of both are converted to two gamma ray photons. 0/+1 e+ 0/-1 e → 2γ This reaction is called an annihilation reaction. The mass of an electron or positron is 9.109 x 10^-31 kg. (a) Calculate the energy produced by the reaction of one electron and one positron (b) Assuming that the two γ ray photons have the same frequency, calculate this frequency

Solved • Dec 6, 2019

Photoelectric Effect

Q. A thallium surface emits electrons after shining with a light source of frequency of 4.24×1023 Hz. Calculate the maximum kinetic energy of the ejected electron if the work function of thallium is 6.88×10-19 J.

Solved • Nov 23, 2019