Ultrasound

Define the term ultrasonography.

Define the term echocardiography.

Which of the following sound frequencies cannot be heard by a human ear?

Three different vibrating objects produce three types of sounds $X, Y$ and $Z$. Sounds $X$ and $Y$ cannot be heard by a man having normal range of hearing but sound $Z$ can be heard easily. The sound $X$ is used in hospitals to break kidney stones of a patient into fine grains which then get flushed out with urine. The sound $Y$ is similar to that which is produced during an earthquake before the main shock wave is generated. Name one device which can produce sound like $X$. Name one device in a science laboratory which can produce sound like $Y$.

The ultrasound waves can penetrate into matter to a large extent because they have :

The speed of highly penetrating ultrasonic waves is:

When we change a feeble sound to a loud sound, we increase its:

A sonar station picks up a return signal after $3$ seconds of sending it. How far away is the object? (Speed of sound in water $=1440 \mathrm{m}/\mathrm{s}$).

Which of the two produces ultrasonic waves: porpoise or whale?

Name an animal which navigates and finds food by echolocation.

What are ultrasonic waves? Name two animals which can produce ultrasonic waves.

Write any three applications (or uses) of ultrasound.

What is ultrasound? What is the difference between ordinary sound and ultrasound?

Explain how, flaws (or defects) in a metal block can be detected by using ultrasound.

Explain how, bats use ultrasound to catch the prey.

Give one use of ultrasound in industry and one in hospitals.

What name is given to sound waves of frequencies higher than $20 \mathrm{kHz}$?

What name is given to the sound waves of frequency too high for humans to hear?

Write the full name of 'SONAR'.

What is the name of the device which is used to find the depth of sea (or ocean) by using ultrasonic sound waves?