Two parallel disks of diameter D = 0.6 m separated by L = 0.4 m are located directly on top of each other. Both disks are black and are maintained at a temperature of 450 K. The back sides of the disks are insulated, and the environment that the disks are in can be considered to be a blackbody at 300 K. Determine the net rate of radiation heat transfer from the disks to the environment.

A dielectric material has an absorption coefficient of 0.25 cm−1. A plate of thickness 3 cm is made from this material, and light with intensity 20 W m−2 is incident on the front. Ignoring reflection losses, calculate the intensity transmitted through the plate.Give your answer as a decimal to 2 d.p.

(e) The Sun has a surface temperature of 5770 K, a radius of 6.96 × 10° km, an average distance from Earth of 1.496 x ix 10* km, and radiates e/m radiation into space isotropically. Earth is a sphere with a radius of 6378 km, and on average absorbs 30 percent of the sunlight that shines on it, with the rest reflected back into space. Both the Sun and Earth are opaque to e/m radiation of all wavelengths, so intensity I = oT“, where o is the Stefan-Boltzmann constant and T is Kelvin temperature. Calculate the temperature (in Kelvins) of Earth.

Assume the intensity of solar radiation incident on the cloud tops of the Earth is 1 677 W/m². (a) Taking the average Earth-Sun separation to be 1.496 x 10¹1 m, calculate the total power radiated by the Sun. 4.905E26 x Your response is within 10% of the correct value. This may be due to roundoff error, or you could have a mistake in your calculation. Carry out all intermediate results to at least four-digit accuracy to minimize roundoff error. W (b) Determine the maximum value of the electric field in the sunlight at the Earth's location. kv/m (c) Determine the maximum value of the magnetic field in the sunlight at the Earth's location. μT