For each change, say if it changes the loudness or the pitch of the sound…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
For each change, say if it changes the loudness or the pitch of the sound.
- A singer sings the same note more strongly.
- A sitar player presses a string shorter, so that it vibrates faster.
- You walk away from a radio.
- A boy blows a whistle with a smaller pipe.
Need a reminder? The key ideaShow
Loudness depends on the amplitude, pitch on the frequency, and quality on the mixture of frequencies. People hear about to : below is infrasound, above is ultrasound.
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Step 1. (a) Loudness: a bigger amplitude, the same note.
Step 2. (b) Pitch: a faster vibration, a higher frequency.
Step 3. (c) Loudness: the sound spreads out and its amplitude falls.
Step 4. (d) Pitch: a smaller air column vibrates faster.
Answer: loudness, pitch, loudness, pitch.
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