If the surface of our bodies is at 37°C, at what wavelength does the radiation that we emit peak if we behave like a blackbody? The constant in Wien's law is 0.0029 m ? K
What will be an ideal response?
9.4 ?m
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If perihelion of Earth were noticeably closer to the sun than is currently the case, what would be the probable affect on the climate of the Southern Hemisphere?
a. Their winter season would be much colder than present. b. Their winter season would be much warmer than present. c. Their summer season would be much colder than present. d. Their summer season would be much warmer than present. e. Their would be no change in any of their seasonal temperatures.
Intensity: Light from a laser forms a 1.31-mm diameter spot on a wall. If the light intensity in the spot is 1.58 × 104 W/m2, what is the power output of the laser? Assume that all the light emitted by the laser hits the spot.
A. 21.3 mW B. 13.2 mW C. 17.9 mW D. 24.7 mW
A wall of thickness L is made up of material with a thermal conductivity that varies with its thickness x according to the equation k=(ax+b) W/(m K) , where a and b are constants. If the heat flux applied at the surface of one end (x=0) of the wall is 20 W/m^2, derive an expression for the temperature gradient and temperature distribution across the wall thickness ( between x=0 and x=L). Use and define appropriate notations for surface temperatures at each end of the wall.
GIVEN • Thermal conductivity (k) varies according to equation k=(ax+b) W/(m K) • Heat flux applied (q/A)=20 W/m^2 FIND • Expression for temperature gradient and temperature distribution across wall thickness. ASSUMPTIONS • One dimensional, steady state conduction through the glass • Constant thermal conductivity
The Sun projects charged particles into space, giving rise to a flow of radiation called the
a. heliosphere. b. solar wind. c. corona. d. chromosphere.