In the far-infrared spectrum of 39K³5Cl(g), there is an intense line at 278.0 cm³¹. Calculate the force constant (in) and the period (in sec) of vibration of 39K³5Cl(g).

1. (Kittel 7.1) Density of orbitals in one and two dimensions. (a) Show that the density of orbitals of a free electron in one dimension is L (2m πλhe independent of E. D₁ (ɛ) = - where L is the length of the line. (b). Show that in two dimensions, for a square of area A, Am 7h² 1/2 D₂(E) =

Periodic Table of Electronegativity below 10 EL 14 15 16 17 1.0 Na Mg 09 12 Be 10 14 15-19 25-29 N F 1.0 4.0 30-40 N 10 11 12 21 3.0 K C Se Co NI Lu Zn A Br O.N 10 1 19 16 Rb NE Mo Ku Ag 19 22 1.9 17 19 Re IN AL Ilg PE 19 118 (13 11 1 | IT 15 Lanthanudoctr Actinides % ionic character = {1 - cxp[-(0.25XX, – X,}]] × 100 Where X, X, are the electronegativities of the A and B atoms, respectively TQ21 What type(s) of bonding would be expected for each of the following materials: (a) Cal- (b) Bronze (a copper-tin alloy) (c) Brass (a copper-zinc alloy) (d) Argons gas (e) Nylon (f) Diamond (g) Aluminum oxide (A1203) (h) Titanium (Ti) Rubber () Muminum phosphide (AIP) (k) Solid xenon (1) Barium sulfide (BaS) L

A piezo electric crystal having a thickness of 2.45mm and a voltage sensitivity of 0.018Vm/N is subjected to pressure of 20 * 10^3 Pa. what is the output voltage?

2. What is the principle of RAMAN spectroscopy. Why is RAMAN spectroscopy considered a complement to IR spectroscopy, give examples of materials where it is used very commonly.

The speed of sound in air is 340 m/s, and the speed of light is 3.0 X 108 m/s. What frequency oflight has the same wavelength as a 200.0 Hz sound wave?