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?
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- using transitions of excited states to find wavelength:A sodium surface is illuminated with 384-nm light. (a) Determine the energy of each photon in joules. (Enter your answer to at least four significant figures.) (b) Determine the energy of each photon in electron volts. (Enter your answer to at least three decimal places.) ev (c) Determine the maximum kinetic energy in electron volts of the ejected photoelectrons. ev(2.13) Selection rules in hydrogen Hydrogen atoms are excited (by a pulse of laser light that drives a multi-photon process) to a spe- cific configuration and the subsequent spontaneous emission is resolved using a spectrograph. Infra- red and visible spectral lines are detected only at the wavelengths 4.05 um, 1.87 µm and 0.656 µm. Explain these observations and give the values of n and l for the configurations involved in these transitions.
- Pls help ASAP.1) The Sun cranks out about 4 x 1026 J/s, i.e. its radiant power pe = 4 x 10²6 W. For a square meter of area here on the Earth whose surface normal points directly to the Sun, how many watts are received? How many 550-nm photons would that correspond to? (The Earth-Sun distance is about 150x100 km.)This question relates to the practicality of searching for intelligent life in other solar systems by detecting their radio broadcasts (or aliens find us from ours). The closest stars are 4 light years away from us. How far away must you be from a 460 kHz radio station with power 50.0 kW for there to be only one photon per second per square meter? Assume that the photons spread out spherically. The area of a sphere is 4??24πr2. b) How many lightyears away is this?