Physics for Scientists and Engineers: Foundations and Connections
1st Edition
ISBN: 9781133939146
Author: Katz, Debora M.
Publisher: Cengage Learning
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Chapter 34, Problem 21PQ
Ultraviolet (UV)
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Sunscreen contains compounds that absorb ultraviolet light. When
sunscreen is applied to skin, it prevents ultraviolet light from reach-
ing the skin. The graph that follows shows the absorbance of light
as a function of wavelength for two different compounds (2-EHMC
and TDSA) common in sunscreen. Absorbance is a measure of the
amount of light absorbed by the compound-the higher the absor-
bance, the more light is absorbed. Study the graph and answer the
questions.
0.6
UV-E
UV-A
0.5
0.4-
2-EHMC
0.3
TDSA
0.2-
0.1
290 300 310 320 330 340 350 360 370 380 390 400
Wavelength (nm)
Assuming that sunlight produces 3.066 x 10".
UV photons
and
m -s
that the skin absorbs one-half of these photons (and reflects
the other half), calculate the total UV energy absorbed over
0.42 m of skin that is exposed to sunlight for one hour.
Assume that the average wavelength of the UV photons is
330 nm.
Absorba nce
Gamma rays typically have frequencies above 10 exahertz (or 10^19 Hz). What is the corresponding
wavelength in units of picometers (pm) of a gamma ray with a 3*10^19 H? (1pm-10^-12m)
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F6
F7
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8
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F12
PrtSc
The Sun has a temperature of approximately 5800 K.
a) What is the peak wavelength of light emitted by the Sun?
b) How much energy does one photon of this wavelength have?
c) How much power is emitted by the Sun if it has an emissivity of 0.9? (The Sun has a radius of 6.96x10^8 m.)
d) How much mass is converted to energy every second in the Sun's core to drive its power emission?
Please write your answers in the space below and email your work.
ALT+510(BOLO ALTHEN+510 (Mac)
Chapter 34 Solutions
Physics for Scientists and Engineers: Foundations and Connections
Ch. 34.1 - Prob. 34.1CECh. 34.2 - Prob. 34.2CECh. 34.4 - The electric part of an electromagnetic wave is...Ch. 34.5 - Prob. 34.4CECh. 34.5 - Prob. 34.5CECh. 34.6 - Prob. 34.6CECh. 34.8 - Prob. 34.7CECh. 34 - Prob. 1PQCh. 34 - Prob. 2PQCh. 34 - A circular coil of radius 0.50 m is placed in a...
Ch. 34 - Prob. 4PQCh. 34 - A solenoid with n turns per unit length has radius...Ch. 34 - Prob. 6PQCh. 34 - Prob. 7PQCh. 34 - Prob. 8PQCh. 34 - Prob. 9PQCh. 34 - Prob. 10PQCh. 34 - Prob. 11PQCh. 34 - Prob. 12PQCh. 34 - Prob. 13PQCh. 34 - Prob. 14PQCh. 34 - Prob. 15PQCh. 34 - Prob. 16PQCh. 34 - Prob. 17PQCh. 34 - Prob. 18PQCh. 34 - Prob. 19PQCh. 34 - Prob. 20PQCh. 34 - Ultraviolet (UV) radiation is a part of the...Ch. 34 - Prob. 22PQCh. 34 - What is the frequency of the blue-violet light of...Ch. 34 - Prob. 24PQCh. 34 - Prob. 25PQCh. 34 - Prob. 26PQCh. 34 - WGVU-AM is a radio station that serves the Grand...Ch. 34 - Suppose the magnetic field of an electromagnetic...Ch. 34 - Prob. 29PQCh. 34 - Prob. 30PQCh. 34 - Prob. 31PQCh. 34 - Prob. 32PQCh. 34 - Prob. 33PQCh. 34 - Prob. 34PQCh. 34 - Prob. 35PQCh. 34 - Prob. 36PQCh. 34 - Prob. 37PQCh. 34 - Prob. 38PQCh. 34 - Prob. 39PQCh. 34 - Prob. 40PQCh. 34 - Prob. 41PQCh. 34 - Prob. 42PQCh. 34 - Prob. 43PQCh. 34 - Prob. 44PQCh. 34 - Prob. 45PQCh. 34 - Prob. 46PQCh. 34 - Prob. 47PQCh. 34 - Prob. 48PQCh. 34 - Prob. 49PQCh. 34 - Prob. 50PQCh. 34 - Prob. 51PQCh. 34 - Prob. 52PQCh. 34 - Optical tweezers use light from a laser to move...Ch. 34 - Prob. 54PQCh. 34 - Prob. 55PQCh. 34 - Prob. 57PQCh. 34 - Prob. 58PQCh. 34 - Prob. 59PQCh. 34 - Prob. 60PQCh. 34 - Some unpolarized light has an intensity of 1365...Ch. 34 - Prob. 62PQCh. 34 - Prob. 63PQCh. 34 - Prob. 64PQCh. 34 - Unpolarized light passes through three polarizing...Ch. 34 - The average EarthSun distance is 1.00 astronomical...Ch. 34 - Prob. 67PQCh. 34 - Prob. 68PQCh. 34 - Prob. 69PQCh. 34 - Prob. 70PQCh. 34 - Prob. 71PQCh. 34 - Prob. 72PQCh. 34 - Prob. 73PQCh. 34 - Prob. 74PQCh. 34 - CASE STUDY In Example 34.6 (page 1111), we...Ch. 34 - Prob. 76PQCh. 34 - Prob. 77PQCh. 34 - Prob. 78PQCh. 34 - Prob. 79PQCh. 34 - Prob. 80PQCh. 34 - Prob. 81PQCh. 34 - Prob. 82PQCh. 34 - Prob. 83PQCh. 34 - In Section 34-1, we summarized classical...
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, physics and related others by exploring similar questions and additional content below.Similar questions
- The Sun has a temperature of approximately 5800 K. a) What is the peak wavelength of light emitted by the Sun? b) How much energy does one photon of this wavelength have? c) How much power is emitted by the Sun if it has an emissivity of 0.9? (The Sun has a radius of 6.96x10^8 m.) d) How much mass is converted to energy every second in the Sun's core to drive its power emission? Please write your answers in the space below and email your work. For the toolbar, press ALT+F10 (PC) or ALT+FN+F10 (Mac).arrow_forwardProxima Centauri, the nearest star to our Sun, has a surface temperature of 2,768.85 °C. What is its total intensity emitted? O 4.3 MW per square meter. O 4.9 MW per square meter. O 5.2 MW per square meter. O 5.7 MW per square meter. O 6.4 MW per square meter.arrow_forwardThe temperature of an object is 163°C. What is the peak wavelength (in µm) of the radiation emitted by the object at this temperature?arrow_forward
- Quantum Dot: Patent number 60-985-841 is for a quantum dot that only emits and absorbs three wavelengths of light. The quantum dot is engineered to have three different electron energy levels: E₁=0.60 eV, E₂ = 2.53 eV, and E3 = 4.15 eV. The quantum dot contains a electron. single What is the minimum wavelength of light will this quantum dot will absorb and emit? Report your result in nanometers (nm).arrow_forwardSuppose a hot object radiates with the twice the intensity as the sun on earth, i.e. 2600W/m2. What is the energy density of this radiation?arrow_forwardThe Sun has a surface temperature of 5770 K, a radius of 6.96 × 105 km, an average distance from Earth of1.496 × 108 km, and radiates e/m radiation into space isotropically. Earth is a sphere with a radius of 6378 km,and on average absorbs 30 percent of the sunlight that shines on it, with the rest reflected back into space.Both the Sun and Earth are opaque to e/m radiation of all wavelengths, so intensity I = σT4, where σ is theStefan-Boltzmann constant and T is Kelvin temperature. Calculate the temperature (in Kelvins) of Earth.arrow_forward
- At what wavelength is the radiation emitted by the human body at its maximum? Assume a temperature of 37°C.arrow_forwardThe temperature of human skin is approximately 34°C. Calculate the peak wavelength of the radiation emitted from the skin.arrow_forwardGamma rays typically have frequencies above 10 exahertz (or >1019 Hz). What is the corresponding wavelength in units of picometers (pm) of a gamma ray with a 3 * 1019 Hz? (1 pm = 10-12 m)?arrow_forward
- The temperature of a student's skin is 33.0°C. At what wavelength does the radiation emitted from the skin reach its peak? umarrow_forwardIn a LASER, the energy of the emitted light comes from: a) The thermal energy of the active material which emits the laser light. b) The binding energy of the nuclei in active material which emits the laser light. c) The pumping beam.arrow_forwardA Sun-like star has a power output of 3.0·1026 W with 89.5% of this energy supplied by the proton-proton chain. How many protons are consumed per second in the core of this star?arrow_forward
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