Question

what is the dimensional formula of frequency

Answer 1

Frequency = 1 /
Time Period
Therefore Dimension of Frequency = T-1

Answer 2

$hi \:$
$here's \: \: your \: \: answer$
Frequency is the defined as number of complete cycles per second.

Mathematically,
Frequency = number of vibrations/sec

Dimensional Formula of Time =

Putting these values in above equation we get
Dimensional Formula of Frequency = 1/ M0L0T1 = M0L0T-1

Hence,
Dimensional Formula of Frequency = M0L0T-1
SI unit of Frequency is the hertz

$hope \: \: this \: \: helps..$