Question

Please give an appropriate reason for the question given above.​

Answer 1

The pitch will increase.

$reason$

Frequency =

$\frac{1}{length \: of \: air \: column}$

Thus, when the man closes the hole near his mouth, the air column decreases, so the frequency increases.

When the frequency increases, the pitch also increases.

$thus \: the \: pitch \: increases.$