Through which state of matter does sound propagate with the slowest speed?

Through which state of matter does sound propagate with the fastest speed?

Define the following term. Also write its SI unit.

Amplitude

Define the following term. Also write its SI unit.

Time period

Define the following term. Also write its SI unit.

Frequency.

Name the characteristic of a vibrating body which determines the loudness of the sound produced by it.

Name the characteristic of a vibrating body which determines the pitch of the sound produced by it.

The frequencies, of the male and female voices in human beings, are nearly $1 \mathrm{kHz}$ and $1.5 \mathrm{kHz}$. Which of the two voices is likely to be flatter?

The frequencies, of male and female voices in human beings, are nearly $1 \mathrm{kHz} \mathrm{and} 1.5 \mathrm{kHz}$. Which of the two voices has a higher pitch?