It will have a D mintmark.
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All circulation half-dollar dated 1971 and later were struck in copper-nickel. The last half dollars containing silver were minted in 1970 and silver proof sets weren't minted again until 1992. Please see the Related Question for more.
Not all silver. It is referred to as silver clad. Silver on both sides (40% by weight) with copper in the center. The semi-solid silver Kennedy half dollar stopped production in 1964, made of 90% silver. See the related link for more information.
Please check the coin again. If you look on the back you'll find that it's a HALF dollar, and if you look on the front you'll see that it shows a picture of Benjamin Franklin who was much older and balder than JFK ever had a chance to become. There's more information at the Related Question.
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Please turn the coin over and check the denomination. It's a 50¢ piece. Please see the question "What is the value of a 1970 Kennedy half dollar?" for more information.
Since the US mint did not open until 1794, I wonder if you are talking about the 1776-1976 Kennedy bicentennial half dollar? Please see the Related Question for details
As of June 4 2011 the melt value of a 90% silver half dollar is $13.13. See the related link below for a updated price. After clicking the link click on silver melt values at the top right of the page. Then scroll down to the link that says 1964 Kennedy half dollar.
The Peace design was used on silver dollars minted from late 1921 to 1935. Your coin is called a Walking Liberty half dollar. Please see the Related Question for more information.
The Peace design was used on silver dollars minted from late 1921 to 1935. Your coin is called a Walking Liberty half dollar. Please see the Related Question for more information.
None, because the coin doesn't exist. JFK is on the HALF dollar. Please see the Related Question for more information.
nothing it's a fakeMoreMorgan dollars (designed by George Morgan, hence the name) were minted from 1878 to 1904 and again in 1921. Are you sure you don't have a walking liberty half dollar? They were minted in 1947 but look very different from a Morgan dollar - and in any case they clearly say "half dollar" on the back. If so, please see the Related Question for values.
All 1978 halves were made of copper-nickel, as are all circulating half dollars minted since 1971. Please see the Related Question for more information.