On the 1st string, which fret will produce the note that is a whole step above D?

The note that is a whole step above D is E. When determining whole steps, it's important to understand that a whole step consists of two half steps. Starting from D, moving up a half step takes us to D# (or Eb), and moving up another half step brings us to E.

On the guitar fretboard, the 1st string is the high E string, and it is typically tuned to E in standard tuning. If you play the open 1st string, you are naturally playing E, but to find E as a whole step above D on this specific string, you will start from D, located at the 10th fret on the 1st string. Moving up to the 12th fret gives you E, confirming that E is indeed the note you reach one whole step above D.

This understanding of whole steps on the fretboard illustrates the relationship between notes and their positions, which is fundamental for navigating and playing the guitar effectively.