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//Chapter 2: Spectroscopy and Photochemistry
//Problem: 1
clc;
//Declaration of Constants
m_br79 = 78.9183 // Mass of 79Br,in amu
m_br81 = 80.9163 // Mass of 91Br,in amu
Na = 6.022 * 10 ** 23 // Mole constant,per mol
pi = 3.141 // Pi
c = 3 * 10 ** 10 // Speed of light,in cm/s
//Declaration of Variable
wave_no = 323.2 // Wave no. of fund. vibration of 79Br - 81Br, /cm
// Solution
mu = (m_br79 * m_br81) / ((m_br79 + m_br81) * Na)
k = 4 * (pi * c * wave_no) ** 2 * mu * 10 ** -3
mprintf("The force constant of the bond is %.2e N/m\n",k)
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