Audible and Inaudible sounds

What is the standard frequency humans can hear:

• 20hz - 200hz

• 10hz - 1000khz

• 50hz - 10hz

• 20hz - 20khz

Animals that hear above 20,000hz:

• dogs

• humans

• elephants

• bats

Animals that hear above 20hz:

• cats

• elephants

• frogs

• humans

When a frequency is higher than 20,000hz it is called:

• Ultrasonic

• Infrasonic

Medical Instruments work at infrasonic. (True or False)

• True

• False