How many protons does a gold atom have: O 1 O 26 79 O 197 ype here to search 近

1. An electron moving in a conjugated bond framework can be viewed as a particle in a box. An externally applied electric field of strength & interacts with the electron in a fashion described by the perturbation: V(r) = ee (x - 1) Where x is the position of the electron in the box, e is the electron charge, and Lis the length of the box. (a) Compute the first order correction to the energy (b) The first order correction to the wave-function (compute only the contribution to Y made by Y2)

You are preparing to compete in the Physics Olympics. Your instructor is coaching you by providing you with challenging problems of the type you might see on an Olympics exam. He comes up with the following problem and gives you 15 minutes to solve it: Imagine a perfectly rigid HCl molecule that does not stretch as it rotates. The equilibrium separation of its ions is 0.127 5 nm. There are two isotopes for chlorine on the sample, Cl-35 and Cl-37. This results in double peaks in the molecular spectrum as shown. (a) Find an expression for the difference in the frequency between the peaks to the right of the gap as a function of the masses of the two chlorine isotopes and the quantum number J. (b) Estimate the difference in frequency numerically for J = 0, without consulting tables. Quick! Get to work!

3. The potential energy of two particles in the electrostatic field when they are separated by a distance r is given by α В -- + 4/8 r 78 U = -- + where a and ẞ are constants. At what separation will they form a stable compound?

17) Shown below is a structure of seven atoms with a "B" atom in the middle surrounded by "A" atoms. Nearest neighbors are separated by ro. A A A B A A A: 42 x 10-2¹ J B: 7 x 10-21 J C: 30 x 10-21 J D: 15 x 10-21 J E: 5 x 10-21 J A How much energy is required to remove only the B atom from the center, given that the well depth for an A-A pair is 2 x 10-2¹J and for a A-B pair is 5 x 10-2¹J?

An Al3+ ion is located 45 nm from an O2- ion, as shown in the figure. How far to the right of the O2- ion (in units of nm) would a proton have to be placed in order for it to be in equilibrium?

A spherical shell of inner radius a cm has a volume charge density p(r, 0) =4/2tr cos 0 c/m³. The potential energy of this configuration is 5 cm and outer radius b = 7 Inner Yadius a=5 cm Outer radius b= 7 cm Volume charge dinsity pcr,@),4 cos0 .clm? Potential Energy

St. John's University - My App X A ALEKS - Iffat Khan G how many valence electrons in x + i www-awn.aleks.com/alekscgi/x/lsl.exe/1o_u-lgNslkr7j8P3jH-lijkPWvZoZLqkt1FLIq7wcPWKzBYGfE9IMFjNG0dB_IllkUmxjvdZ3p44elzs8GVwNxjbe5NR20.. * O MEASUREMENT Setting up the solution to a basic quantitative problem The electric field strength between the plates of a simple air capacitor is equal to the voltage across the plates divided by the distance between them. When a voltage of 94.8 V is put across the plates of such a capacitor an electric field strength of 2.3 kV is measured. cm Write an equation that will let you calculate the distance d between the plates. Your equation should contain only symbols. Be sure you define each symbol. Your equation: d =| Definitions of your symbols: kV D = 2.3 cm = 94,8 V Explanation Check © 2021 McGraw-Hill Education. All Riahts Reserved. Terms of Use I Privacy étv II

3. Calculate the total charge within the volume O.1< |x|, lyl, Iz] < 0.2 given P_V = 1/(x^3 y^3 z^3)*