The absorption coefficient of amorphous Si and CIGS are approximately 10^4 cm^-1 and 10^5 cm^-1 at hv = 1.7 eV, respectively. Determine the amorphous Si and CIGS thickness for each solar cell so that 90% of the photons are absorbed

Now you have a nucleus with 20 protons at x = 7.9 Angstroms on the x-axis. How much work would it take to bring in ANOTHER nucleus with 4 protons from 1 m away and place it at y = 7.0 Angstroms on the y-axis?   Question 10 options: A 50.4 eV B 100.8 eV C -8.2 eV D 109.0 eV

Consider an electron gyrating in the magnetic field associated with a sunspot which has a magnetic field strength of 0.25 T. The typical temperature of a sunspot is 3500 K the equipartition equation for velocity v, temperature T and mass m of a particle, is, 3kgT V = m kB is Boltzmann's constant (1.38×10–23 J/K). a) The mass of the Sun is approximately 2 × 1030 kg. Use this information and the infor- mation given above to compute the acceleration g due to gravity at the surface of the Sun. b) Compute the drift velocity Ūg due to gravity for a proton and an electron located within a sunspot. c) Assuming a typical mass density of the Sun's photosphere of 10-3 kg/m³, compute the number density of protons and electrons in the photosphere (where sunspots reside) assuming that the Sun is comprised of pure ionized hydrogen. d) Calculate the total current density J (accounting for the contributions of both electrons and tons) within sunspots. You may assume that you can treat the ensemble of…

Consider an object of mass 38.7 kg. Assume that it s made up of equal numbers of protons, neutrons, and electrons. How many protons does this object contain?     1.16E+28     2.32E+28     4.64E+28     5.80E+27

A

A material has a mass attenuation coefficient of 0.35 cm²/g (for a given photon energy) and has a density of 1 g/cm³. What is the thickness of the Half-Value Layer (HVL) of this material? (Note: the Half-Value Layer is the material thickness required to reduce an incident beam intensity by a factor of two).

What two pieces of evidence allowed the first calculation of me , the mass of the electron?(a) The ratios qe / me and q p / m p .(b) The values of qe and EB .(c) The ratio qe / me and qe .Justify your response.

Consider an object of mass 76.4 kg. Assume that it s made up of equal numbers of protons, neutrons, and electrons. How many protons does this object contain?     4.58E+28     9.16E+28     1.15E+28     2.29E+28