Physics for Scientists and Engineers with Modern Physics
10th Edition
ISBN: 9781337553292
Author: Raymond A. Serway, John W. Jewett
Publisher: Cengage Learning
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Chapter 39.2, Problem 39.2QQ
To determine
Rank the waves in terms of photon energy from highest to lowest.
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An electron and a 6.70 kg bowling ball each have 4.25 eV of kinetic energy.
HINT
(a)
Calculate 1, the de Broglie wavelength of the electron (in m).
e'
(b)
Calculate 1, the de Broglie wavelength of the bowling ball (in m).
(c)
Calculate the wavelength å, of a 4.25 eV photon (in m).
d.
A dental X-ray typically affects 194 g of tissue and delivers about 3.6 µJ of energy using X-rays that have wavelengths of
0.025 nm.
What is the energy Ephoton, in electron volts, of X-ray photons?
eV
Ephoton =
How many photons are absorbed during the dental X-ray? Assume the body absorbs all of the incident X-rays.
photons
number of photons absorbed:
A recent study found that electrons that have energies between 3.45 eV and 20.5 eV can cause breaks in a DNA molecule even
though they do not ionize the molecule. If a single photon were to transfer its energy to a single electron, what range of light
wavelengths could cause DNA breaks?
minimum wavelength:
radio
In which part of the electromagnetic spectrum does this light lie?
O ultraviolet
infrared
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gamma ray
maximum wavelength:
nm
Chapter 39 Solutions
Physics for Scientists and Engineers with Modern Physics
Ch. 39.1 - Prob. 39.1QQCh. 39.2 - Prob. 39.2QQCh. 39.2 - Prob. 39.3QQCh. 39.2 - Prob. 39.4QQCh. 39.3 - Prob. 39.5QQCh. 39.5 - Prob. 39.6QQCh. 39.6 - Prob. 39.7QQCh. 39 - Prob. 1PCh. 39 - Prob. 2PCh. 39 - Prob. 3P
Ch. 39 - Prob. 4PCh. 39 - Prob. 5PCh. 39 - Prob. 6PCh. 39 - Prob. 8PCh. 39 - Prob. 9PCh. 39 - Prob. 10PCh. 39 - Prob. 11PCh. 39 - Prob. 12PCh. 39 - Prob. 13PCh. 39 - Prob. 15PCh. 39 - Prob. 16PCh. 39 - Prob. 17PCh. 39 - Prob. 18PCh. 39 - Prob. 19PCh. 39 - Prob. 20PCh. 39 - Prob. 22PCh. 39 - Prob. 23PCh. 39 - Prob. 24PCh. 39 - Prob. 25PCh. 39 - Prob. 26PCh. 39 - Prob. 27PCh. 39 - Prob. 30PCh. 39 - Prob. 31PCh. 39 - Prob. 32PCh. 39 - Prob. 33PCh. 39 - Prob. 35PCh. 39 - Prob. 37PCh. 39 - Prob. 38PCh. 39 - Prob. 39PCh. 39 - Prob. 40APCh. 39 - Prob. 41APCh. 39 - Prob. 43APCh. 39 - Prob. 44APCh. 39 - Prob. 45APCh. 39 - Prob. 46APCh. 39 - Prob. 47CPCh. 39 - Prob. 48CPCh. 39 - Prob. 49CPCh. 39 - Prob. 50CP
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- An X-ray machine makes a picture of a broken arm (shown above)by sending high energy photons through an object that is opaque to visible wavelengths and measures the relative intensity of the X-rays that emerge on the other side. Denser substances, such as bone, absorb more photons than less dense substances and thus show up differently. Absorption length 3.4 m Material Air Fat 0.052m Water 0.047m Bone 0.017m Consider the table of X-ray absorptions shown above. Near the center of an arm, the X-rays pass through 2.4 cm of muscle, 3.4 cm of bone, and 3 more cm of muscle. What fraction of the incident X-rays get through this part of the arm? (Hint: assume muscle has the same x-ray stopping power as fat.) Submit Answer Tries 0/99 Assume now that the same beam of X-rays pass through an adjoining portion of the arm (say, directly between the two bones seen), so the path through the arm is the same but the X-rays are only going through muscle and fat. What fraction of the incident X-rays pass…arrow_forwardIn Chapter 22, the intensity of light striking a surface was related to the electric field of the associated electro- magnetic wave. For photons, the intensity is the number of photons striking a 1-m? area per second. Suppose 1.0 x 1012 photons of 497-nm light are incident on a 1-m² surface every second. What is the intensity of the light? Using the wave model of light, what is the maximum electric field of the electromagnetic wave?arrow_forwardThe 1.0 mW light beam from a laser pointer (λ = 670 nm) shines on a screen. How many photons strike the screen each second?arrow_forward
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