Final answer:
It takes 2 hex digits to represent one byte in computers.
Step-by-step explanation:
In computers, a byte is a unit of digital information that consists of 8 bits. Each bit can have a value of 0 or 1, which means that a byte can represent 2^8 possible values. Since a hexadecimal digit can represent 16 possible values (0-9 and A-F), it takes 2 hexadecimal digits to represent one byte.
For example, the decimal value 255 in binary is represented as FF in hexadecimal, where each 'F' represents 4 bits. Therefore, to represent one byte in hexadecimal, we need 2 hex digits.