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Question
Which among the following frequencies is inaudible to humans?
Options:
A .  20 Hz
B .  5 Hz
C .  50 Hz
D .  30 Hz
Answer: Option B
:
B
The audible range for humans is 20Hz to 20kHz. From the above, 5Hz is not audible to humans. Sounds with frequencies below 20Hz are called infrasonic sounds and above20kHz are called ultrasonic sounds.

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