What is the electric field at point A in the figure if d = 2.10 m, R = 0.500 m, 91 = 19.0 nC, and 92 = -27.0 nC? Assume the positive x axis points to the right, through the center of the rings. (Express your answer in vector form.) E = N/C 91 T R d/2d/2. A d⋅ 92 x

A Br selective electrode is applied for measuring bromide ions in saline solution. Cl' ions were found to interfere, with a kPot = 0.0050. %3D After calibration, the ISE equation was determined to be y = -70 mV - 59.2mV*log(x). If we measure a potential of 93 mV, and the [CI]=0.100 M, what was the [Br'] in units of M? O 0.00821 O 0.100 O 0.0050 O 0.123 O Correct answer not found in other options

If the diameter of the low power field is 1.5 mm, an object that occupies approximately a 1/3 of that field has an estimated diameter of what mm?

After performing an FTIR analysis on CO, you plot transition frequency (cm¯1) vs. m and fit your data to a polynomial equation. The equation you obtain is y = -0.027x2 + 4.0x + 2143. Based on these results, what is the value of the fundamental vibrational frequency? cm 1

Solve each equation by factoring or by using the quadratic formula. If the solutions involve square roots, give both the exact solutions and the approximate solutions to three decimal places.: m(m - 7) = -10

Solution A is 20 degrees celsius, Solution B is 80 degrees celsius (both are the same kind of solution). The goal is to make a 50 degree celsius solution; How much of solution A do you need (starting with 100g of solution B)? (cp=4.184 J/g C)

The E1% at 280 nm of the protein myosin is 0.842. You take 40µl of a myosin solution of unknown concentration and add water to a final volume of 2.0 ml. The absorbance of this solution at 280 nm is 0.771. What is the concentration of the undiluted myosin solution? (units = mg/ml).

Assume that you have an “X” solution that you do not know its concentration. But you have other X solutions with known concentrations and you know X solution absorbs maximum light at 575 nm. To calculate the unknown solution concentration, you have done some spectrophotometric measurements and obtained data given below.  Prepare a standard curve by using the absorbance of known concentrations (Hint: you can learn how to prepare a standard curve by using Excell from youtube). Calculate the concentration of unknown.

What is the wavelength of a 6.76 x 1012 /s wave? Sorry im just really stuck on this question, Please dont leave any minor detail in the question, And also may u step by step this equation.

Consider a bi convex lens with radius of curvatures |R1| = 30 mm and |R2| = 180 mm, ct = 5 mm and glass is N-BK7. This is used as camera lens in order to image a man who is at 1 km away from the camera. We want to resolve 10 cm on his body. Assume that λ = 550 nm. Using zemax, determine the MTF value for the resolution of R = 80 lp / mm in image plane which is placed at paraxial focus. (Hint: First, find the diameter of the lens)   Which one: a.32.1 % b.28.7 % c.12.3 % d.58.5 % e.46.8 % f.57.2 % g.20.9 % h.15.6 %