By Anjum Altaf When I discovered ‘frequency’ I felt empowered and reacted much as Archimedes did by letting out a high-pitched shriek – Eureka (“I have found it”). At least for me it was an empowering feeling to finally figure out what I had been talking about. Let us get two things out of the way before we forge ahead. First, the term ‘high-pitched shriek’ is really a tautology: a shriek, by definition, is high-pitched. If you don’t believe me, try and emit a low-pitched shriek. What you might succeed in emitting would be a low-volume shriek but the shriek itself would retain a high pitch. This is a useful exercise because it would help you distinguish clearly between the two attributes of sound we have learnt so far – volume and frequency.