Imagine an isothermal, completely gas-based atmosphere with an absorption coefficient of 0.03 m^2kg^-1 across all wavelengths.  A)Find the height at which the maximum rate of absorption of a radiation beam oriented at a 30 angle from the zenith occurs. Assume that the scale height is H = 10 km and that the surface pressure is 100 × 10^3 Pa. B) Compute the height above which 80% of the incoming radiation is absorbed

11A.4 Radiation of wavelength 268 nm passed through 1.5 mm of a solution that contained benzene in a transparent solvent at a concentration of 0.080 mol dm^−3. The intensity of the radiation is reduced to 22 per cent of its initial value (so T = 0.22). (a) Calculate the absorbance and the molar absorption coefficient of the benzene. (b) What would be the transmittance through a cell of thickness 3.0 mm?   Before solving the problem please also give a brief explanation of the concept or associated equation(s) and variables

Describe how the attenuation of X-rays correlate with i) their photon energy, ii) the chemical make-up of the transmission material, and iii) the distance they have travelled through the material.

The percent transmission, % T, is defined as follows. percent transmission = х 100% 1, = intensity of the light entering the sample | intensity of the light leaving the sample sample If the sample absorbs no light, I = lo, the percent transmittance will be equal to 100%. If the sample absorbs the light completely, I = 0, the percent transmittance will be equal to 0. Thus, the greater the amount of light absorbed by the sample, the smaller the percent transmittance. You are given the following solutions, E will have the lowest %T and A will have the lowest absorbance. The lambda max for these solution should be around 620 nm. А В D E

The molar absorption coefficient of a solute at 540 nm is 386 dm3 mol−1 cm−1. When light of that wavelength passes through a 5.00 mm cell containing a solution of the solute, 38.5 per cent of the light was absorbed. What is the molar concentration of the solute?

The percentage transmittance of light at 250 nm through a certain aqueous solution is 20.0% at 25°C. The experimental cell length is 1.0 cm, and the concentration of the solution is 5 × 10-4 mol L-1 . Calculate the absorbance.Calculate the molar absorption coefficient.

β-carotene has a molar absorptivity of 100,000 dm^3 mol^-1 cm^-1 a certain wavelength. Calculate the amount of carotene in a 1.00 cm cell needed to absorb 90% of the incident radiation.

In a photochemical experiment it is observed that 5.78×10-5 mol of uranyl oxalate is decomposed at a wavelength of 300 nm emitted by a lamp in one hour. When acetone was irradiated with the same lamp for 10 hours, the amount of acetone decomposed was found to be 2.32× 10-4 mol. What is quantumyield for the acetone decomposition under the same condition?

Suppose a student is preparing a set of standard solutions for use in a spectrophotometric study. If percent transmittance, %T, were measured in the standard solutions before the color had a chance to fully develop, the measured value would be compared with solutions that have allowed the color to fully develop.

A beam of light with an irradiance of Po passes through a solution of a substance that can absorb some of the light. The pathlength of the solution is b cm, and the molar concentration of the substance is c M. The irradiance of the emerging light is P. Absorbance (A), transmittance (T), and molar absorptivity (e) are quantities calculated from these values. Identify the expression used for calculating each of these three quantities. = = Po P P Po = P₁ - P = log (P) = log (Po-P) = = log (P) P log (2) = Abc = = A bc bc A Answer Bank molar absorbtivity (e) transmittance (T) absorbance (A)