Range of Hearing

The most significant benefit of wearing hearing aids had been the ability to communicate with family and friends.

Explain the significance of hearing aid.

Choose the part of a hearing aid from the following.

A hearing aid is a small electronic device that you wear in or behind your ear.

Define hearing aid and its importance.

Which of the following is an application of ultrasound?

One of the following can hear infrasound. This one is -

Sound below the frequency of _____ $\mathrm{Hz}$ is called infrasonic sound.

Which of the following is an application of ultrasound?

The frequency, which is audible to the human ear is -

Sound with frequency less than $20 \mathrm{Hz}$ is known as _____ sound.

Describe the importance of hearing aid.

What do dolphins, bats, and porpoise use for hearing?

In SONAR, we use

Name two animals which can produce infrasonic waves. 

The limit of audibility is

Choose the right word and fill in the blank:

People who cannot hear properly have _____. (spectacles/hearing aid)

Define ultrasound and infrasonic sound.

What is the frequency of ultrasound?

Define ultra and infrasonic sounds.