Current Attempt in Progress An object is inside a room that has a constant temperature of 294 K. Via radiation, the object emits three times as much power as it absorbs from the room. What is the temperature (in kelvins) of the object? Assume that the temperature of the object remains constant eTextbook and Media GO Tutorial Save for Later Attempts: 0 of 10 used Submit Answer

Current Attempt in Progress An object is inside a room that has a constant temperature of 294 K. Via radiation, the object emits three times as much power as it absorbs from the room. What is the temperature (in kelvins) of the object? Assume that the temperature of the object remains constant eTextbook and Media GO Tutorial Save for Later Attempts: 0 of 10 used Submit Answer

College Physics

1st Edition

ISBN:9781938168000

Author:Paul Peter Urone, Roger Hinrichs

Publisher:Paul Peter Urone, Roger Hinrichs

Chapter24: Electromagnetic Waves

Section: Chapter Questions

Problem 29PE: Integrated Concepts (a) Calculate the rate in watts at which heat transfer through radiation occurs...

See similar textbooks

Similar questions

Integrated Concepts (a) Calculate the rate in watts at which heat transfer through radiation occurs (almost entirely in the infrared] from 1.0 m2of the Earth’s surface at night. Assume the emissivity is 0.90, the temperature of the Earth is 15°C, and that of outer space is 2.7 K. (b) Compare the intensity at this radiation with that coming to the Earth from the Sun during the day, which averages about 800 W/m2, only hall of which is absorbed. (c) What is the maximum magnetic field strength in the outgoing radiation, assuming it is a continuous wave?
Nuclear fusion - the energy source of the Sun, hydrogen bombs, and fusion reactors - occurs much more readily when the average kinetic energy of the nuclei is high.a) Suppose you want the nuclei in your fusion experiment to have average kinetic energies of 6.85 × 10-14 J. What temperature, in kelvins, is needed for that?
Earth’s surface absorbs an average of about 960. W/m2 from the Sun’s irradiance. The power absorbed is Pabs = (960. W/m2) (Adisc), where Adisc = π(RE)2 is Earth’s projected area. An equal amount of power is radiated so that Earth remains in thermal equilibrium with its environment at nearly 0 K. Estimate Earth’s surface temperature by setting the radiated power from Stefan’s law equal to the absorbed power and solving for the temperature in Kelvin. In Stefan’s law, assume e = 1 and take the area to be A = 4π(RE)2, the surface area of a spherical Earth. (Note : Earth’s atmosphere acts like a blanket and warms the planet to a global average about 30 K above the value calculated here.)
A 50 g ice cube at 00C is heated until 45 g has become water at 1000C and 5 g has become steam at 1000C. Determine the amount of heat that can be added to accomplish this? [ Cwater=4186Jkg-1K-1, Lv=2.26×106Jkg-1, Lf=3.33×105Jkg-1]
A 3-mm-thick glass window transmits 90 percent of the radiation between l = 0.3 and 3.0 mm and is essentially opaque for radiation at other wavelengths. Determine the rate of radiation transmitted through a 2-m * 2-m glass window from blackbody sources at (a) 5800 K and (b) 1000 K.
A 50 g ice cube at 00C is heated until 45 g has become water at 1000C and 5 g has become steam at 1000C. Determine the amount of heat that can be added to accomplish this? [ Cwater = 4186Jkg-1k-1, Lv = 2.26 * 10⁶ Jkg-1, Lf=3.33 * 105Jkg-1
Solar energy strikes the top of the Earth’s atmosphere at 343 W m−2. About 30 per cent of this energy is reflected directly back into space. The Earth–atmosphere system absorbs the remaining energy and re-radiates it into space as black-body radiation at 5.672 × 10−8(T/K)4 W m−2, where T is the temperature. Assuming that the arrangement has come to equilibrium, what is the average black-body temperature of the Earth? Calculate the wavelength at which the black-body radiation from the Earth is at a maximum.
It is often argued that the head is the most important part of the body to cover when out in cold weather. Estimate the total energy loss by radiation if a person’s head is uncovered for 19.4 min on a very cold, −15.0°C day, assuming he is bald, his skin temperature is 35.0°C, and that skin has an emissivity (in the infrared) of 97.0%. Assume that the man’s head is spherical, with a radius of 10.0 cm. The Stefan–Boltzmann constant is 5.670 × 10−8 W/ (m2·K4).
Our sun, currently a yellow dwarf, will eventually evolve to a red giant star and then to a white dwarf star as shown in the figure. Assume that the sun radiates like a blackbody. Calculate the power radiated by the WHITE DWARF sun if its surface temperature is 8000 K.
Leila is building an aluminum-roofed shed in her backyard to store her garden tools. The flat roof will measure 2.0 m X 3.0 m in area during the coldest winter months when the temperature is - 10°C, but temperatures in Leila's neighborhood can reach as high as 38°C in the summer. What is the area of the roof that should stick out from the shed in the summer so that the roof just fits the structure during cold winter nights? (aaluminum = 24 × 10-6°C-1)
Satellites designed to observe the radiation from cold (3 K) dark space have sensors that are shaded from the Sun, Earth, and the Moon and are cooled to very low temperatures. Why must the sensors be at low temperature?
Estimate the total energy loss by radiation if a person’s head is uncovered for 13.3 min on a very cold, −15.0°C day, assuming he is bald, his skin temperature is 35.0°C, and that skin has an emissivity (in the infrared) of 97.0%. Assume that the man’s head is spherical, with a radius of 10.0 cm. The Stefan–Boltzmann constant is 5.670 × 10−8 W/ (m2·K4).