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The Particle Nature of Light

Q. A solution of KMnO4 absorbs light at 540 nm. b) What is the energy of one mole of photons with λ = 540 nm?

Solved • Apr 1, 2020

The Particle Nature of Light

Q. Some chemical reactions, such as formation of ozone in Earth's stratosphere, can be initiated by light that has a wavelength less than some particular value. Calculate the longest wavelength (nm) that can provide an energy of a least 445 kJ/mol.

Solved • Apr 1, 2020

The Particle Nature of Light

Q. A green LED laser is pointed at a glass of water whose volume is 591 mL. The specific heat of water is 1.000 cal/g˚C and the density of water is 1.008 g/mL. (a) One photon emitted by the LED has a wavelength of 666 nm. Determine the energy of this photon. (b) If all the energy from the LED is absorbed by the water, how many mols of photons will it take to raise the temperature of the water by 4.0 ˚C?

Solved • Apr 1, 2020

The Particle Nature of Light

Q. A red LED laser is pointed at a glass of water whose volume is 473 mL. The specific heat of water is 1.000 cal/g˚C and the density of water is 1.008 g/mL. a) One photon emitted by the LED has a wavelength of 888 nm. Determine the energy of this photon. b) If all the energy from the LED is absorbed by the water, how many mols of photos will it take to raise the temperature of the water by 12.0 ˚C?

Solved • Mar 31, 2020

The Particle Nature of Light

Q. Consider the following energy levels of a hypothetical atom: E4 = −1.0 × 10−19 J E3 = −5.0 × 10−19 J E2 = −1.0 × 10−18 J E1 = −1.5 × 10−18 J When an electron drops from the E2 level to the E1 level, the atoms are said to undergo emission. Calculate the wavelength (in nm) of the photon emitted in this process. Enter your answer in scientific notation.

Solved • Mar 29, 2020

The Particle Nature of Light

Q. Calculate the frequency when an electron drops from n = 3 to the n = 2 level in a hydrogen atom. Give your answer to three significant digits.

Solved • Mar 29, 2020

The Particle Nature of Light

Q. In scenario D, visible light has a photon energy of 4.321 x 10^-19 J. Determine its wavelength, frequency, and color. The visible light in scenario D is _______

Solved • Mar 24, 2020