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?

When is a given sound regarded as a 'musical sound' or 'music'?

Explain briefly the mechanism of production of sound in human beings.

How does the mechanism of production of sounds in birds differ from that in human beings?

On a hot summer day, a little mosquito produces a warning sound near your ear by vibrating its wings at the rate of $3,000$wing beats per five seconds. State the frequency, in hertz, of this sound.

Explain why we always hear the thunder a little after we see the flash of lightning.