A Lambertian source of radiance 10 W /m² sr is made in the shape of a ring. What is the irradiance at the point P? 0, = arcsin(0.25) and 0m = arcsin(0.5). out

3. Excited Ground state state 4. 4.85E-19 J 1 (ground state) 4.42E-19J 4. 1. 3.98E-19 J 3. 3.03E-19J 1. 1 (ground state) Energy Energy emitted paquosqe 2) [30] Energy Levels Above is a schematic of a Hydrogen atom with its first 5 energy levels. On the right is the energy emitted from the transitions (lines pointing down on the diagram). Using the knowledge that energy and wavelength are hc, connected ( E =") you will figure out the wavelength for each of these %3D transitions. E- %3D h = Planck constant = 6.63E-34 J*s C = speed of light = 3E8 m/s 2 = wavelength in meters E = energy in Joules (J) %3D %3D %3D %3D hc %3D E. will be in meters! Divide by 10-9 for nm %3D If you need help converting this to a color easier, try this website once you get the wavelength in nm: https://academo.org/demos/wavelength-to- colour-relationship/

A stars wavelength is observed to be 200 nm. Calculate the approximate surface temperature of the star

1.2) In a region of gas where the optical depth is 2.0, what percentage of photons can escape without being scattered or absorbed?