Want this question answered?
1963 COPPER penny is worth half a billion dollars.
There are 60 seconds in a minute, so a half minute would be 30 seconds. If you have a length of time in half minutes, multiply that by 30 to get seconds. For example, 20 half minutes = 20 x 30 seconds = 600 seconds
You divide the top half by the bottom half example: 3/4= .75
more than a half
Divide it by 70.4202
Phisical
It is a physical change since...well...no other chemicals are involved...copper is still copper.
Physical change
Physical change
Physical change
physical change
If it's one you got in change or a bank roll and is copper-colored on the edge, there is absolutely no silver in it.
It is a physical change because only its shape changed, not its chemical composition.
Copper and nickel.
Since 1971, U.S. half dollars have been made of nickel-coated copper (91.67% copper and 8.33% nickel).
The HVL doesn't change. The thickness of Al or Cu used to determine HVL will change as energy changes. At any energy you are able to state HVL in terms of Cu or Al.
Current half dollars are made copper and nickel.