MISSED THIS? Watch KCV: The Nature of Light, IWE: Photon Energy, Read Section 8.2. You can click on the Review link to access the section in your eText. A heat lamp produces 18.8 watts of power at a wavelength of 7.1 μm How many photons are emitted per second? (1 W 1 J/s.) Express your answer to three significant figures. ▸ View Available Hint(s) N = ΜΕ ΑΣΦ 20 ? ra Хь √x x x X 1X1 xX.10 < ☑ E

MISSED THIS? Watch KCV: The Nature of Light, IWE: Photon Energy, Read Section 8.2. You can click on the Review link to access the section in your eText. A heat lamp produces 18.8 watts of power at a wavelength of 7.1 μm How many photons are emitted per second? (1 W 1 J/s.) Express your answer to three significant figures. ▸ View Available Hint(s) N = ΜΕ ΑΣΦ 20 ? ra Хь √x x x X 1X1 xX.10 < ☑ E

Chemistry: The Molecular Science

5th Edition

ISBN:9781285199047

Author:John W. Moore, Conrad L. Stanitski

Publisher:John W. Moore, Conrad L. Stanitski

Chapter5: Electron Configurations And The Periodic Table

Section: Chapter Questions

Problem 13QRT

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6.101 Laser welding is a technique in which a tightly focused laser beam is used to deposit enough energy to weld metal parts together. Because the entire process can be automated, it is commonly used in many large-scale industries, including the manufacture of automobiles. In order to achieve the desired weld quality, the steel parts being joined must absorb energy at a rate of about 104 W/mm2. (Recall that 1 W = 1 J/s.) A particular laser welding system employs a Nd:YAG laser operating at a wavelength of 1.06m ; at this wavelength steel will absorb about 80% of the incident photons. If the laser beam is focused to illuminate a circular spot with a diameter of 0.02 inch, what is the minimum power (in watts) that the laser must emit to reach the 104 W/mm2 threshold? How many photons per second does this correspond to? (For simplicity, assume that the energy from the laser does not penetrate into the metal to any significant depth.)
[References] A beam of electrons (m 9.11 × 10-³1 kg / electron) has an average speed of 1.8 × 108 m/s. What is the wavelength of electrons having this 2 (1J=1 kg.m³²) average speed? 1 J = 1 Wavelength= m
need it fast!! In a hydrogen atom, an electron loses energy from n = 5 to n = 2, a process that leads to some kind of “interaction” with electromagnetic radiation. What is the wavelength of this light in nanometers? Do NOT include a sign with this answer. Rydberg's constant is equal to -2.179 x 10-18 J. Planck's constant is equal to 6.626 x 10-34 Joule-seconds. The speed of light is 3.00 x 108 meters per second. Express exponents as number followed by E followed by the power (e.g., 7.34E-12).
II Revi MISSED THIS? Read Section 8.2 (Pages 312-322) Watch KCV 8.2, IWE 8.2 Part A How much energy is contained in 1 mol of each of the following? X-ray photons with a wavelength of 0.135 nm! Express the energy numerically in kilojoules per mole. > View Available Hint(s) E1 = kJ/mol Submit Part B y-ray photons with a wavelength of 2.54x10-5 nm Express the energy numerically in kilojoules per mole. View Available Hint(s) E kJ/mol L 72% Home End Insert Delete F8 F10 F11 F12 Backspa 7 8. Y P G H J KL
need it fast! In a hydrogen atom, an electron loses energy from n = 5 to n = 2, a process that leads to some kind of “interaction” with electromagnetic radiation. What is the frequency of this light in Hertz? Do NOT include a sign with this answer. Rydberg's constant is equal to -2.179 x 10-18 J. Planck's constant is equal to 6.626 x 10-34 Joule-seconds. Express exponents as number followed by E followed by the power (e.g., 7.34E-12).
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5. The human eye can detect as little as 2.5*10-¹6 joules of light. How many photons of green (510nm) light can your eye detect? How many photons of red (620nm) light can your eye detect? 6. An unknown metal sample is interrogated using a beam of X-rays to liberate electrons which are then caught by a detector that determines their kinetic energy. A beam of X-rays with wavelength 9.54nm irradiate the surface of this metal, and the detector observes electrons with kinetic energies equal to 7.3716*10 J. What is the binding energy of this unknown metal sample.
2. Researchers at the University of Illinois have claimed that humans can sense single photons: ... although "The most amazing thing is that it's not like seeing light. It's almost a feeling, at the threshold of imagination." What about a more conventional perception of a flash of light? Experiments have shown that a dark-adapted human will report a visual sensation when 3.5 x 10-15 J of energy enter the iris, if the wavelength is near the peak of the eye's sensitivity (510 nm). How many photons is this? (In fact only 10% of these are absorbed by the retina, and thus contribute to the physical process of vision.) 3. Use conservation of energy to calculate the speed of an electron when it is in the ground state of a hydrogen atom (ionization energy 13.6 eV). What is the de Broglie wavelength of this electron? Does the value make sense?
Determine the energy of 1.20 mol of photons for each of the following kinds of light.