A good answer might be:

An infinite number of digits (or bits).

Shifting Left One Bit

Let us return to paper-and-pencil positional notation. Here is a binary expression: 

0001.0100 = 1.2510

Here is the same pattern, shifted left by one bit: 

0010.1000 = 2.5010

QUESTION 12:

What does shifting left by one bit do?