there is only one groove on each side
One.
An LP uses a needle to read the grooves in the vynal. The CD does the same thing but uses a laser
One. Starts at the edge, finishes in the middle.
a quarter has 130 grooves.
150 grooves
A quarter has 119 grooves, or reeds. The grooves are used as an anti-counterfeiting strategy.
59
According to the U.S. Mint, a dime has 118 reeds (grooves).
There are no "grooves" on a British 1 Penny coin. The edge is not milled.
According to the U.S. Mint, a dime has 118 reeds (grooves).
There is one groove on each side. However, there are a few exceptions of note. Some vinyl records were actually produced with two grooves on one side, and the contents heard depended on which groove the stylus cueued to. See link for details.
LP field holds almost 70,000 people.