Find the speed for a star in which this line appears at wavelength 121.1 nmnm.. Express your answer to three significant figures and include the appropriate units.

1. A glass window allows 95% of radiant energy between 0.32 < 1 < 2.6 microns to pass. Any wavelength outside of this range will not pass through the glass. Compute the energy rate passed through the glass window if the incident energy rate on the glass is 1200 W/m^2. 0.9 0.4 E0-a ot 0.4 0.2 0.1 15,000 AT(Micron-Rankine) S000 10,000 20.000 25,000 30,000 33,000 00 1.0 2.0 3.0 4.0 5.0 6.0 7.0 Amax Ans. 1026 W/m^2

A glass window pane and a pyrex window pane are held together as shown below. Heat is flowing through the combination from the hot side to the cold side. The temperatures of the hot surface and the cold surface are shown, with the temperature of the surface between them. The glass pane has a thickness of 3.00 mm. Find the thickness of the pyrex pane. (The cross-sectional areas are not needed.) Thermal conductivity of glass kglass = 0.800 J/s-m-C° Thermal conductivity of pyrex: kpyrex = 1.15 J/s-m-C° pyrex glass heat heat 3.00 mm T, = 38 °c T3 = 20° c %3D T2 = 23.4°C

What would you expect the linear coefficient of absorption values of Aluminium, Cop- per and Lead to compare to one another. Would you expect the same relation between the mass absorption coefficients?