When the air pressure near the ear drum decreases, it ____.

The conversion of the amplified pressure vibrations to electrical signals is done by _____.

• Auditory nerve transmits the signals from the internal ear (cochlea) to the brain.
• Ear ossicles amplify the sound.

The ear drum receives the sound in the form of ____.

The sounds with frequencies smaller than 20 Hz are called _____.

• Sounds with frequencies 20Hz to 20kHz are called audible frequencies.
• Sounds with frequencies more than 20Khz are called ultrasound.

The sonar can detect the enemy ship using _________.

Distance can be measured using ___________ .

Which of the following amplifies the pressure variations causing the sound?

If the audible sound frequency increases, then the sound becomes ______.

Anvil is a part of ____.

Human can hear ultrasounds.

The audible frequency range can be more than 20000Hz.

Cochlea is a part of which of these?

The shape of the atomic structure can be found by ______.

Decreasing amplitude decreases _______.

• The amplitude of a vibrating body continuously decreases during damped vibrations.
• Because the frictional (resistive) force due to the surrounding medium causes the energy loss.

Which of the following parts acts as a passage for the sound waves into the ear?

Which of the following organs vibrate on encountering a sound?

• Ear pinna collects the sound and directs them into the ear.