It depends on the date and variety.
1964 coins are 90% silver and 10% copper.
1965-70 are 40% silver
1971 and later circulating halves are made of copper-nickel
1992 and later Prestige Proofs (sold only to collectors) are 90% silver.
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The Kennedy half dollar was struck in 90% silver in 1964. The following year, this was changed to silver-clad, with the silver content lowered to 40%. In 1971, the circulation coinage composition was changed a final time, eliminating the silver, and using the copper-nickel clad standard common to the dollar, quarter, and dime. Bicentennial half dollars dated 1776-1976 were produced in the years 1975 and 1976 in the copper-nickel clad composition for circulation and proof and also in the 40% silver composition in uncirculated and proof versions for inclusion in special collector sets. When the United States Mint started producing silver proof sets in 1992, the Kennedy half dollar included in them had the same composition as the coins of 1964.
No US silver coin made for general circulation is all silver, they are made of 90% silver and 10% copper. 1964 is the only year for 90% Kennedy halves, 1965-1970 are 40% and 1971 to date are copper-nickel.
Yes. All U.S. half dollars dated 1965-1970 are 40% silver, though none dated '70 were released for circulation.