They're actually called Walking LIBERTY half dollars because the "lady" is Miss Liberty herself.
The year, mint mark and the condition of that coin will determine what it is worth. It has a value of at least $6-8 for its silver content, but more information would be needed to provide a more specific answer. The silver market is volatile and prices vary daily. The would-be collector or vendor of a coin might check eBay to see if any coins like it are offered for sale. The prices and bidding might allow an investigator to get a ball park value for the coin.
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It's actually a Walking Liberty half dollar not a "Lady Liberty." Coins of this series dated from 1940 to 1947 are all very common and have the same values of $17.00 in the grades of G-4 to EF-40.
It's actually a Walking Liberty half dollar, coins of this series dated from 1940 to 1947 are all very common and have the same retail values of $14.00 in average condition.
Actually it's called a Walking LIBERTY half because the lady is Miss Liberty herself. There's more information at the Related Question.
All Walking Liberty half dollars (1916-1947) have the same silver content of .36169oz of pure silver.
The value of a 1940 Lady Liberty half dollar can vary based on its condition and rarity. On average, a circulated 1940 Lady Liberty half dollar could be worth around $10 to $20. However, if the coin is in excellent condition or has any special features, it could be worth more to collectors. It is always recommended to have a coin appraised by a professional to determine its exact value.