How Does Potassium Nitrate Affect the Solubility of Silver Bromide?

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The discussion focuses on determining the molar solubility of silver bromide (AgBr) in a 0.100-M potassium nitrate (KNO3) solution, using the provided solubility product constant (Ksp) and activity coefficients for silver (γAg+) and bromide (γBr-). The Ksp for AgBr at 25°C is 5.0E-13, and various ionic strengths (μ) are associated with specific activity coefficients. The activity coefficients decrease as ionic strength increases, affecting the solubility of AgBr. The calculations involve applying these coefficients to find the molar solubility in the KNO3 solution. Understanding the role of activity coefficients is crucial for accurately determining solubility in ionic solutions.
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The question is :

For AgBr at 25C, with Ksp= 5.0E-13

For KNO3 solutions:

μ=0.050
γAg+ =0.8105
γBr- =0.8227

μ=0.0100
γAg+ =0.7565
γBr- =0.7794

μ=0.150
γAg+ =0.7199
γBr- =0.7529

μ=0.200
γAg+ =0.6914
γBr- =0.7340


Find the molar solubility of AgBr in 0.100-M potassium nitrate solution

what does these stand for?
γAg
γBr
 
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γ is the activity coefficient.