The power output of a laser is measured by its wattage, the number of joules of energy it radiates per second (1 W = 1 J s). A 225-mW krypton laser produces a beam of yellow light with a wavelength of 568.2 nm (5.682×10-' m). (a) Calculate the energy carried by each photon. (b) Calculate the number of photons emitted by the laser per second. (a) J per photon (b) photons per second

The power output of a laser is measured by its wattage, the number of joules of energy it radiates per second (1 W = 1 J s). A 225-mW krypton laser produces a beam of yellow light with a wavelength of 568.2 nm (5.682×10-' m). (a) Calculate the energy carried by each photon. (b) Calculate the number of photons emitted by the laser per second. (a) J per photon (b) photons per second

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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The work function of metal is the minimum energy required to produce photoelectric effect on that metal, and the work function for potassium metal is 220. kJ/mol (a) What is the minimum energy in Joules required to eject an electron from potassium metal? (b) What is the longest wavelength of light, in nanometers (nm), capable of producing photoelectric effect on potassium metal? (c) If the surface of a piece of potassium metal is shone with a green light having wavelength, 2. = 510. nm, what is the kinetic energy of the ejected electron? (d) What is the speed (in m/s) of the ejected electron? (Planck's constant, h= 6.626 x 10 34 J•s.; speed of light, c = 3.00 x 10° m/s; m = 9.11 x 10 ³1 kg; i ev = 1.60 x 10-19 J; 1J=1 kgm³/s²)
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Answer the following questions about a Blu-ray laser:(a) The laser on a Blu-ray player has a wavelength of 405 nm. In what region of the electromagnetic spectrum is this radiation? What is its frequency? (b) A Blu-ray laser has a power of 5 milliwatts (1 watt = 1 J s−1). How many photons of light are produced by the laser in 1 hour? (c) The ideal resolution of a player using a laser (such as a Blu-ray player), which determines how close together data can be stored on a compact disk, is determined using the following formula: Resolution = 0.60(λ/NA), where λis the wavelength of the laser and NA is the numerical aperture. Numerical aperture is a measure of the size of the spot of light on the disk; the larger the NA, the smaller the spot. In a typical Blu-ray system, NA = 0.95. If the 405-nm laser is used in a Blu-ray player, what is the closest that information can be stored on a Blu-ray disk? (d) The data density of a Blu-ray disk using a 405-nm laser is 1.5 × 107 bits mm−2. Disks have…
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