On the diatonic scale the frequency of the note Re is 81. The frequency of Ga will be :

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Solution

The correct option is A 90
Given,

$f_{R e} = 81 H z$

The frequency of Ga will be,

$f_{G a} \frac{9}{10} = f_{R e}$

$f_{G a} = \frac{10}{9} \times 81$

$f_{G a} = 90 H z$

The correct option is B.

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