Exam-hall rules — tune the hall
This is the boss. No calculator — the numbers are chosen to live in your head, and 0.606 rounds to six-tenths without shame. One long sound check, worked line by line, and every answer feeds the next: write them down as you go.
The whole chapter rides in it — the warmth in the speed of sound, , the string's , and the beat that two close pitches make. 5★ under par here is the chapter crown. Tune the hall.
- = Speed of sound (speed)
- = Air temperature (temperature)
- = Wave speed (speed)
- = Frequency (frequency)
- = Wavelength (length)
- = Fundamental frequency (frequency)
- = Wave speed on the string (speed)
- = String length (length)
- = Beat frequency
- = Higher frequency
- = Lower frequency
each variable a frequency
no calculator in the boss room — the numbers are chosen to fit in your head