Inicieu la sessió

Physics for IGCSE & O level - Waves And Sounds (Section 1 - No. 31)

What is the frequency of ultrasound?

Less than 20 Hz

Between 20 Hz and 20 kHz

Greater than 20 kHz

Equal to 20 kHz

Explicació

Ultrasound has a frequency greater than 20 kHz.

Comentaris (0)

Anunci