(Q) A colored solution of a given substance obeys Baber's law. It showed a transmittance of 80% when measured in an absorbent cell of 1cm thickness A/- What is the percentage of permeability for another solution of the same substance whose concentration is twice the original concentration under the same conditions b- What should be the value of the cell thickness to keep the peak of the transmittance at 80% when the concentration is twice the original concentration C- If the original concentration is equal to 0.005% w/v, what is the value of the specific absorbance (a)?

prelab 2) please see attached

Please don't provide handwritten solution ....

You are working in a laboratory that makes frequent use of a scanning tunneling microscope (STM) to study surfaces of materials. The current through the tip of an STM (see figure) is very sensitive to differences in the width of the gap between the tip and the sample surface. Assume the transmission coefficient for the electron falls off exponentially in this direction with a decay length of 0.100 nm, that is, with C = 10.0 nm¯¹ in T = e−2CL. Your supervisor asks you to determine the ratio of the current when the STM tip is 0.498 nm above a surface feature (I) to the current when the tip is 0.526 nm above the surface (I2). + (i)