Audible, Infra and Ultrasound

In industry ultrasonic waves are widely employed for quality control testing.

_____ beam used for underwater observation, communication and navigation in the study of oceanography.

What are two uses for ultrasound?

Bats can sense _____ sound.

What are the different uses of ultrasonic sound?

What is echocardiography?

Bats sense obstacles through their ears.

Name the scientist who discovered the special mechanism in bats.

Cotyledons are also called-