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 44, Problem 25P
(a)
To determine
The wavelength at which the
(b)
To determine
The part of the
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Which of the following statements about a black body are true?
Select one or more:
a.The spectrum of the cosmic background radiation corresponds with great accuracy to the radiation of a black body at a temperature of 2.7 K.
b.A black body absorbs all the radiation that hits it, and emits no radiation at all.
c.According to Planck's radiation law (black body distribution), the wavelength corresponding to the maximum energy density of the radiation decreases (and the frequency increases) as the temperature increases.
d.A black body reflects all the radiation that hits it, and absorbs no radiation at all.
Suppose that the microwave radiation has a wavelength of 11.6 cm. How many photons are required to heat 265 mL of coffee from 25.0 degrees Celcius to 62.0 degrees Celcius? Assume that the coffee has the same density, 0.997 g/mL, and specific heat capacity, 4.184 J/(g.K), as water over this temperature range.
The spectrum of radiation from a blackbody at a temperature of T = 3500 K reaches a maximum at the wavelength . At what values of the length will be the maximum if the temperature is raised to T=5800 K.
Chapter 44 Solutions
Physics for Scientists and Engineers with Modern Physics
Ch. 44.2 - Prob. 44.1QQCh. 44.5 - Prob. 44.3QQCh. 44.5 - Prob. 44.4QQCh. 44.8 - Prob. 44.5QQCh. 44.8 - Prob. 44.6QQCh. 44 - Prob. 1PCh. 44 - Prob. 2PCh. 44 - Prob. 3PCh. 44 - Prob. 4PCh. 44 - Prob. 5P
Ch. 44 - Prob. 6PCh. 44 - Prob. 7PCh. 44 - Prob. 8PCh. 44 - Prob. 9PCh. 44 - Prob. 10PCh. 44 - Prob. 11PCh. 44 - Prob. 12PCh. 44 - Prob. 13PCh. 44 - Prob. 14PCh. 44 - Prob. 15PCh. 44 - Prob. 16PCh. 44 - Prob. 17PCh. 44 - Prob. 18PCh. 44 - Prob. 20PCh. 44 - Prob. 21PCh. 44 - Prob. 22PCh. 44 - Prob. 23PCh. 44 - Prob. 24PCh. 44 - Prob. 25PCh. 44 - Prob. 26PCh. 44 - Prob. 27PCh. 44 - Prob. 29PCh. 44 - Prob. 30PCh. 44 - The various spectral lines observed in the light...Ch. 44 - Prob. 33PCh. 44 - Prob. 34APCh. 44 - Prob. 35APCh. 44 - Prob. 36APCh. 44 - Prob. 37APCh. 44 - Prob. 38APCh. 44 - Prob. 39APCh. 44 - Prob. 40APCh. 44 - An unstable particle, initially at rest, decays...Ch. 44 - Prob. 42APCh. 44 - Prob. 43APCh. 44 - Prob. 44APCh. 44 - Prob. 45APCh. 44 - Prob. 46CPCh. 44 - Prob. 47CPCh. 44 - Prob. 48CPCh. 44 - Prob. 49CP
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- Treat the human body as a blackbody and determine the percentage increase in the total power of its radiation when its temperature increases from 98.6 °F to 103 ° F.arrow_forwardA black body at a high temperature T kelvin radiates energy at the rate of E W/m2. If the temperature falls by 30% (i.e., to 0.7*T kelvin), the radiation energy rate will be a) 0.7*E b) E/0.7 c) 0.24*E d) 4.16*Earrow_forwardWhich of the following statements is true regarding how blackbody radiation changes as the temperature of the radiating object increases? 1. Both the maximum intensity and the peak wavelength decrease. 2. Both the maximum intensity and the peak wavelength increase. 3. The maximum intensity increases, and the peak wavelength decreases. 4. The maximum intensity decreases, and the peak wavelength increases.arrow_forward
- The surface temperature of Sun is about 6000 K. If we consider the Sun as a black body, what is the radiation power per unit of area?(Given the Stefan-Boltzmann constant is )arrow_forwardIf 1.88 × 10¹⁸ photons fall per cm² per cm² area of a radiation detector exposed to light coming from a source and the value of 0.77 J cm⁻d min⁻¹ is read from the meter, what should be the wavelength of the incident light?arrow_forwardA furnace emits radiation at 2000 K. Treating it as black body radiation, calculate the wavelength at which the emission is maximum. a.) 1.449 x 10 ^ -6 m b.) 2.449 x 10 ^ -6 m c.) 3.449 x 10 ^ -6 m d.) 4.449 x10 ^ -6 marrow_forward
- Why did scientists choose to study blackbody radiation from something as complicated as a hollow container rather than the radiation from something simple, such as a thin, solid cylinder (such as a dime)?arrow_forwardThe intensity of blackbody radiation peaks at a wavelength of 513 nm. Determine the power radiated per unit area (in W/m2) of the radiation source at this temperature.arrow_forwardConsider the following statements about electromagnetic radiation and decide whether they are true or false. If they are false, correct them. (a) The total intensity of radiation emitted from a black body at absolute temperature T is directly proportional to the temperature. (b) As the temperature of a black body increases, the wavelength at which the maximum intensity is found decreases. (c) Photons of radio-frequency radiation are higher in energy than photons of ultraviolet radiation. (d) Photons of ultraviolet radiation have less energy than photons of infrared radiation. (e) The kinetic energy of an electron ejected from a metal surface when the metal is irradiated with ultraviolet radiation is independent of the frequency of the radiation. (f) The energy of a photon is inversely proportional to the wavelength of the radiation.arrow_forward
- For the thermal radiation from an ideal blackbody radiator with a surface temperature of 2000 K, let Ic represent the intensity per unit wavelength according to the classical expression for the spectral radiancy and IP represent the corresponding intensity per unit wavelength according to the Planck expression.What is the ratio Ic/IP for a wavelength of (a) 400 nm (at the blue end of the visible spectrum) and (b) 200 mm (in the far infrared)? (c) Does the classical expression agree with the Planck expression in the shorter wavelength range or the longer wavelength range?arrow_forwardCalculate the temperature of a blackbody if the spectral distribution peaks at (a) gamma rays, λ = 1.50 x 10-14 m; (b) x rays, 1.50 nm; (c) red light, 640 nm; (d) broadcast television waves, λ = 1.00 m; and (e) AM radio waves, λ = 204m.arrow_forwardA laser emits a pulse of light that lasts 10 ns. The light has a wavelength of 690 nm, and each pulse has an energy of 480 mJ. How many photons are emitted in each pulse? Let 1 eV = 1.60 × 10−19 J, the mass of an electron m = 9.11 × 10−31 kg, the speed of light c = 3.00 × 108 m/s, and Planck’s constant h = 4.136 × 10−15 eV ∙ s.arrow_forward
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