Difficulty | Secondary School | High school/other |
★ | Basic | Easy |
★★ | Demanding | Basic |
★★★ | Demanding | |
★★★★ | Difficult | |
★★★★★ | Very difficult |
Specify the frequency of the sound generator. (Note: Video contains audio)
Answer: 439 Hz or 441 Hz
Difficulty | Secondary School | High school/other |
★ | Basic | Easy |
★★ | Demanding | Basic |
★★★ | Demanding | |
★★★★ | Difficult | |
★★★★★ | Very difficult |
Specify the frequency of the sound generator. (Note: Video contains audio)