The measure of semi tone in a Tempered scale is :

Correct option is A

Correct Option-a)
The Equal Temperament (Tempered) scale is a modern tuning system that divides an octave into 12 exactly equal intervals.
Information Booster:
· The measure of a semitone (the interval between any two adjacent keys on a piano, e.g., C to C#) in the Tempered scale is 100 Cents.
· Since an octave (a 2:1 frequency ratio) is defined as 1200 Cents, dividing this by 12 equal semitones gives: 1200 / 12 = 100 Cents per semitone.
· This mathematical uniformity is the defining characteristic of the Equal Temperament system, allowing free modulation across all keys.
Additional Knowledge:
· 50 Cents would be half a semitone (a quarter-tone).
· 25 Cents is an even smaller microtonal division.
· 51.1 Cents is close to the theoretical size of a Shruti in the ancient 22-Shruti system (1200/22 ≈ 54.5 cents), not the tempered semitone.