← Physics (0625)
Q1 / 5
Sound
Foundation
2 marks
What is the difference between infrasound and ultrasound?
A
Infrasound: below 20 Hz (too low to hear); Ultrasound: above 20 kHz (too high to hear)
B
Infrasound: above 20 kHz; Ultrasound: below 20 Hz
C
Both are the same frequency range
D
Infrasound is produced only by machines; ultrasound only by animals
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Sound — Physics (0625) | Smartzi