College Physics
1st Edition
ISBN: 9781938168000
Author: Paul Peter Urone, Roger Hinrichs
Publisher: OpenStax College
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Chapter 30, Problem 62PE
Integrated Concepts
A carbon dioxide laser used in surgery emits infrared
(a) How many photons were required? You may assume flesh has the same heat of vaporization as water. (b) What was the minimum power output during the flash?
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A carbon dioxide laser used in surgery emits infraredradiation with a wavelength of 10.6 μm . In 1.00 ms, thislaser raised the temperature of 1.00 cm3 of flesh to 100ºCand evaporated it.(a) How many photons were required? You may assume fleshhas the same heat of vaporization as water. (b) What was theminimum power output during the flash?
Chapter 30 Solutions
College Physics
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To answer...Ch. 30 - (a) Which line in the Balmer series is the first...Ch. 30 - A wavelength of 4.653 m is observed in a hydrogen...Ch. 30 - A singly ionized helium ion has only one electron...Ch. 30 - A beryllium ion with a single electron (denoted...Ch. 30 - Atoms can be ionized by thermal collisions, such...Ch. 30 - Verify Equations rn=n2ZaB and...Ch. 30 - The wavelength of the four Balmer series lines for...Ch. 30 - (a) What is the shortest-wavelength x-ray...Ch. 30 - A color television tube also generates some x rays...Ch. 30 - An x ray tube has an applied voltage of 100 kV....Ch. 30 - The maximum characteristic x-ray photon energy...Ch. 30 - What are the approximate energies of the K and K...Ch. 30 - Figure 30.39 shows the energy-level diagram for...Ch. 30 - A helium-neon laser is pumped by electric...Ch. 30 - Ruby lasers have chromium atoms doped in an...Ch. 30 - (a) What energy photons can pump chromium atoms in...Ch. 30 - Some of the most powerful lasers are based on the...Ch. 30 - If an atom has an electron in the n=5 state with...Ch. 30 - An atom has an electron with m1=2. 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- A carbon dioxide laser used in surgery emits infrared radiation with a wavelength of 10.6 µm . In 1.00 ms, this laser raised the temperature of 1.00 cm of flesh to and evaporated it. (a) How many photons were required? You may assume that flesh has the same heat of vaporization as water, (b) What was the minimum power output during the flash?arrow_forwardWhich has a greater momentum: an UV photon or an IR photon?arrow_forwardCheck Your Understanding An incident 71-pm X-ray is incident on a calcite target. Find the wavelength of the X-ray scattered at a 60° angle. What is the smallest shift that can be expected in this experiment?arrow_forward
- Check Your Understanding Cut-off frequency for the photoelectric effect in some materials is 8.01013 Hz. When the incident light has a frequency of 121014 Hz. the stopping potential is measured as -0.16 V. Estimate a value of Planck’s constant from these data (in units J • s and eV • s ) and determine the percentage error of your estimation.arrow_forwardCheck Your Understanding What is de Broglie’s wavelength of a non-relativistic proton with a kinetic energy of 1.0 eV?arrow_forwardCheck Your Understanding A yellow 589-nm light is incident on a surface whose work function is 1.20 eV. What is the stopping potential? What is the cut-off wavelength?arrow_forward
- X-rays of wavelength 12.3 pm are scattered from a block of carbon. What are the wavelengths of photons scattered at (a) 30°; (b) 90°; and, (c) 180° ?arrow_forwardAn AM radio transmitter radiates 500 kW at a frequency of 760 kHz. How many photons per second does the emitter emit?arrow_forwardFind the maximum velocity of photoelectrons ejected by an 80-nm radiation, if the work function of photoelectrode is 4.73 eV.arrow_forward
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