They either stopped or you already won..? I am not sure I am not smart enough for this
Answer:
The view factor for radiation emitted by surface 2 to surface 1 is 0.1
Explanation:
Given
Required
Determine
To do this, we make use of the following equivalent ratio
Make the subject
Substitute values into the equation
Answer:
Hence wavelength of the photons produced by the laser is
Explanation:
Given
Efficiency of laser - 30%
As we know
h = plank's constant
c = speed of light
eV0 = band gap
Hence wavelength of the photons produced by the laser is