Chapter_7_and_8_Solutions_Oct_19

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Dec 6, 2023

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Problem: A dental hygienist uses x- rays, λ = 1.00 Å, to take a series of dental radiographs while the patient listens to a radio station, λ = 307.5 cm and looks out the window at the blue sky, λ = 473 nm. What is the frequency of the electromagnetic radiation from each source? (Not all examples will be done in class!) Electromagnetic Radiation Dr. L. Dawe CH110/120/130 Fall 2023
Recall: Electromagnetic Radiation greatest frequencies. lowest frequencies. Which will exhibit the longest wavelengths? A) X-rays B) Ultraviolet C) Microwave D) Radiowaves Dr. L. Dawe CH110/120/130 Fall 2023
Recall: Electromagnetic Radiation Shortest wavelengths; greatest frequencies. Longest wavelengths; lowest frequencies. Which will exhibit the longest wavelengths? A) X-rays B) Ultraviolet C) Microwave D) Radiowaves Recall that there is an inverse relationship between frequency and wavelength. Dr. L. Dawe CH110/120/130 Fall 2023
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Quantum Theory Problem: For radiation of wavelength 242.4 nm, the longest wavelength that will bring about the photodissociation of O 2 , what is the energy of (a) one photon, and (b) a mole of photons? (c) If 1 mole of these 242.4 nm photons were absorbed by 10.0 kg of water and all went into increasing the temperature, what would the change in temperature be? Dr. L. Dawe CH110/120/130 Fall 2023
Quantum Theory Problem: For radiation of wavelength 242.4 nm, the longest wavelength that will bring about the photodissociation of O 2 , what is the energy of (a) one photon, and (b) a mole of photons? Dr. L. Dawe CH110/120/130 Fall 2023
Quantum Theory Problem: For radiation of wavelength 242.4 nm, the longest wavelength that will bring about the photodissociation of O 2 , what is the energy of (a) one photon, and (b) a mole of photons? Dr. L. Dawe CH110/120/130 Fall 2023
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Quantum Theory Problem: (c) If 1 mole of these 242.4 nm photons were absorbed by 10.0 kg of water and all went into increasing the temperature, what would the change in temperature be? Dr. L. Dawe CH110/120/130 Fall 2023
Quantum Theory Problem: “For Practice 7.2” from your textbook; 1 W = 1 J/s If all the light emitted from a 100 W light bulb has a wavelength of 525 nm, how many photons are emitted per second? Dr. L. Dawe CH110/120/130 Fall 2023
Quantum Theory Problem: “For Practice 7.2” from your textbook; 1 W = 1 J/s If all the light emitted from a 100 W light bulb has a wavelength of 525 nm, how many photons are emitted per second? Dr. L. Dawe CH110/120/130 Fall 2023
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Quantum Theory Problem: “For Practice 7.2” from your textbook; 1 W = 1 J/s If all the light emitted from a 100 W light bulb has a wavelength of 525 nm, how many photons are emitted per second? Dr. L. Dawe CH110/120/130 Fall 2023

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