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The Energy of Light

#### Q. It takes about 650 kJ of energy to boil a cup of water. A photon of the electromagnetic radiation used in microwave ovens has an energy of about 1.62 X 10-24. About how many microwave photons are needed to boil a cup of water? A) 4.0 X 1029 B) 9.7 X 1038 C) 6.02 X 1023 D) Need the wavelength to know. Says A is the answer

Solved • Apr 19, 2020

The Energy of Light

#### Q. A beam of radiation has an energy of 2.88×102 kJ/mol. What is the wavelength of this light?

Solved • Apr 17, 2020

The Energy of Light

#### Q. What is the frequency of a photon having an energy of 4.91 × 10–17 ? (c = 3.00 × 108m/s, h = 6.63 × 10–34 J · s)

Solved • Apr 6, 2020

The Energy of Light

#### Q. What is the energy per mole of photons with a wavelength of 307.1 nm?

Solved • Apr 6, 2020

The Energy of Light

#### Q. Nitrogen laser pulse has a wavelength of 337 nm. Calculate the energy of photon of nitrogen laser pulse. (Use equation E = hc/ λ , where h is 6.626 x 10-34 J.s and c is 3.00 x 108 m/s).

Solved • Apr 6, 2020

The Energy of Light

#### Q. The spectrum shown here is for aspirin. The vertical axis is the amount of light absorbed, and the horizontal axis is the wavelength of incident light (in nm). B. What is the energy of one mole of photons with λ = 238 nm? C. What region of the electromagnetic spectrum is covered by the spectrum above? a) infrared region b) x-rays region c) visible light region d) ultraviolet region D. Knowing that aspirin only absorbs light in the region depicted by this spectrum, what is the color of aspirin? a) aspirin is colorless b) aspirin is beige c) aspirin is yellow d) aspirin is pink

Solved • Apr 1, 2020

The Energy of Light

#### Q. Radiation in the ultraviolet region of the electromagnetic spectrum is quite energetic. It is radiation that causes dyes to fade and your skin to develop sunburn. If you are bombarded with 1.0 mol of photons with a wavelength of 325 nm, what amount of energy, in kilojoules per mole of photons, are you being subjected to?

Solved • Apr 1, 2020