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72 solutions

The Particle Nature of Light

Q. How many photons are contained in a flash of red light from helium-neon laser at 632.8nm wavelength that has an energy of 150 KJ?

Solved • Dec 7, 2019

The Particle Nature of Light

Q. UVC light used in sterilizers, has wavelengths between 100 to 280 nm. If a certain UVC wave has a wavelength of 111.5 nm, what is the energy of one of its photons in J? Once you have the value, take it log (base 10) and enter that with three decimal places as your answer. Do not enter units.

Solved • Dec 3, 2019

The Particle Nature of Light

Q. The energy required to ionize sodium is 496 kJ/mol. What is the minimum frequency of light is required to ionize sodium?

Solved • Dec 2, 2019

The Particle Nature of Light

Q. When an electron falls from a higher to a lower energy level in an atom, the photon released has a wavelength of 121.6 nm. What is the energy difference between the two energy levels, in J?

Solved • Nov 23, 2019

The Particle Nature of Light

Q. In a future hydrogen-fuel economy, the cheapest source of H2 will certainly be water. It takes 467 kJ to produce 1 mol of H atoms from water. What is the frequency, wavelength, and minimum energy of a photon that can free an H atom in water? Enter your answer in scientific notation.

Solved • Nov 13, 2019

The Particle Nature of Light

Q. Find the longest wavelengths of light that can cleave the bonds in elemental nitrogen, oxygen, and fluorine. The average bond energy of N-N bond is 945 kJ/mol, oxygen is 498 kJ/mol, and F-F is 159 kJ/mol. Give your answer in scientific notation.

Solved • Nov 13, 2019

The Particle Nature of Light

Q. Rank the following colors of visible light from the highest to the lowest energy, including their estimated energy (show your calculations): Blue, Red, Green, Violet

Solved • Oct 30, 2019