Satellites designed to observe the radiation from cold (3 K) dark space have sensors that are shaded from the Sun, Earth, and Moon and that are cooled to very low temperatures. Why must the sensors be at low temperature?

Q: It takes 5000 J of energy to raise the temperature of a 1.5 kg sample of an unknown material by…

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Q: If the Kelvin temperature of a spherical object were increased by 20%, by approximately what factor…

A: Using Stefan-Boltzmann law, rate of radiated energy is, Qt=σeAT4

Q: A star radiates 3.75 times less power than the Sun. What is the ratio of the temperature of the star…

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Q: What is the percent increase in the energy radiated by a person with a average body temperature of…

A: Given : Normal temperature of person, T1 = 37oC = 273 + 37 = 310 K Temperature rises to, T2 = 40oC =…

Q: Estimate the energy per second (power) radiated from the Sun assuming its surface temperature is…

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Q: Why are thermometers that are used in weather stations shielded from the sunshine? What does a…

A: Thermometers are used to measure the temperature or the temperature gradient of their surroundings.…

Q: The amount of radiant energy emitted by a surface is given by q = ɛ0 AT+ where q represents the rate…

A: Dimensional Analysis Dimensional Analysis is a method of studying the dimensions of complex physical…

Q: Assume an object is emitting blackbody radiation. If the Kelvin temperature of an object is doubled,…

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Q: copper kg. of mass 0.12 kg, is placed into the calorimeter. The temperature of both the oil and the…

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Q: A spherical surface of area 0.5m2, emissivity 0.85 and temperature 132°C is placed in a large,…

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Q: f the air in this region of the tube slowly drops from the ambient temperature of 27 ⁰C to -100 ⁰C.…

A: Given figure as,

Q: In order to lose 1 pound per week, you need to reduce your daily intake by 500 Calories per day. For…

A: In order to lose one pound per week, you need to create a calorie deficit of 500 calories per day.…

Q: If a blackbody is radiating at T=1330 K at what wavelength is the maximum intensity?

A: According to Wien's displacement law the black body radiation curve for different temperatures peaks…

Q: The warmest temperature ever recorded in the United States is 134 °F in Death Valley, CA, on 10 July…

A: Temprature, T°F =134 °F We have to convert this temprature into Kelvins.

Q: The power radiated per square centimeters * from skin at a temperature of 20°C is 0.041 watt per…

A: Area (A) = 1 cm2= 0.0001 m2Temperature of skin (T) = 20oC = 293 kelvin

Q: Use the value of the solar energy flux on Earth to determine the radius of the Sun. Assuming that…

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Q: A white star that has a surface temperature (in kelvins) that is four times that of our sun the…

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Q: At the surface temperature of the sun T = 5800 k, diameter R = 7 * 10^8 m, and at the average…

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Q: A certain furnace (essentially a blackbody) emits 300 W of power when operating at a temperature of…

A: Given data The power emitted by the furnace is given as P1 = 300 W. The initial temperature of the…

Q: A star has a surface temperature of 6400 K. The intensity of a sunspot is found to be 1/3 the…

A: The expression for the intensity can be written as I=σT4…

Q: A star has a power output of 2.5 x 1026 W and a radius of 8.92 x 108 m. Calculate the surface…

A: A black body is an ideal body that is capable of absorbing all the radiation that falls on it. For…

Q: At night, the surface of the earth cools, mostly by radiation. The surface radiates energy upward;…

A: Why does being under a tree keeps the ground warmer?

Q: A 1400 kg car moving at 115 km/h could be converted entirely into heat. What amount of water could…

A: The objective of the question is to find out the amount of water that can be heated from 25 degrees…

Q: During a bout with the flu an 80-kg person ran a fever of 39 oC. Consider that the specific heat of…

A: The amount of heat energy to increase the temperature is  H = m c (T' - T)  Where, m is the mass, c…

Q: As a cook you hold place a metal pan(with a wooden handle attached to it) on top a hot flame and…

A: Given As a cook you hold place a metal pan(with a wooden handle attached to it) on top a hot flame…

Q: L 40 cm

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Q: A copper sphere of 1.01 m diameter is coated with lamp black and maintained at a temperature of…

A: We have to find- Energy radiated in 2 mins (Q)=? Given that- T=5130 K d=1.01 m r=d2=1.012=0.505 m…

Q: What is the lowest temperature that will cause a blackbody to emit radiation that peaks in the…

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Q: A spherical blackbody of 5 cm in radius is in equilibrium with its surroundings. It then absorbs 50…

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Q: Calculate the amount of radiation emitted for a unit surface (1 m2) for a white ball at 53°C and…

A: Given data, Surface Area (A)=1 m2 Temperature (T)=530C Emissivity (ε)=0.12

Q: The temperatures of objects A and B are measured, and it is seen that the temperature of B is 72 K…

A: Given TB-TA=72K Recall T=273.15+θWhere θ is in degree celsius.

Q: your team is developing insulation for the interior of a spaceship for a trip to Mars. Should you…

A: your team is developing insulation for the interior of a spaceship for a trip to Mars. Should you…

Q: A black sphere of radius 2 cm is at a temperature of 27°C and another black sphere of radius 3 cm is…

A: To compare-Rate of emission of heat R1R2=?The data given as-Radius of first black sphere (r1)=2…

Q: Our sun, currently a yellow dwarf, will eventually evolve to a red giant star and then to a white…

A: Assume that the sun radiates like a blackbody, Stefan-Boltzmann law, P = σAT4where, σ is…

Q: In Joule's experiment, if a 10.0 kg mass falls a distance of 1.0 m, and the paddle is immersed in a…

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