Scientists use light waves in SONAR devices to measure the depth of oceans.

Fill in the blank space by choosing the correct word from the list given below : List: ultrasonic, frequency, reflecting, sonar, amplitude The device used to measure the depth of sea is called _________ .

In SONAR, we use :

A light wave can travel

Potometer is a device used for measuring rate of

A device used to measure very high temperature is

Light waves can be polarised as they are

The device used to hear heartbeats is called a

Name two devices which are used to measure the volume of an object.

Name the part of the vernier callipers which is used to measure the following depth of a small bottle,

Three devices used for measuring length