Three questions from the live banks behind Numeracy, MIDI & Sequencing and Synthesis. In the studio they are marked as you answer, retried and tracked; here they are shown with the answer revealed.
Numeracy · 2.5
A sound wave has a period of 0.002 seconds. What is its frequency?
Frequency = 1 / Period. f = 1 / 0.002 = 500 Hz. The period is the time for one complete cycle; frequency is how many cycles occur per second.
MIDI & Sequencing · 1.5
In General MIDI (GM), which channel is reserved for drum and percussion sounds?
The General MIDI standard reserves channel 10 exclusively for drums and percussion. On this channel, each note number triggers a different drum sound rather than a pitched instrument.
Synthesis · 1.3
Which waveform contains only the fundamental frequency with no harmonics?
A sine wave is the purest waveform: it contains only the fundamental frequency and no harmonic content. Sawtooth, square and triangle waves are all combinations of multiple sine waves at different harmonics.
The full Revise banks run to twenty questions a topic, marked as you answer, retried and tracked against your record. The tracking is what membership adds. The free tools need no account; the record of your answers is what you sign in for.