What do you understand by the term ultrasonic vibrations ?
Q.1. What do you understand by the term ultrasonic vibrations ?
Ans. Sounds of frequency higher than 20,000 Hz are called the ultrasonics.
Q.2. Name three animals which can hear ultrasonic vibrations.
Ans. Monkey, dog and bat can hear ultrasonic vibrations.
Q.3. What are elastic waves? Name two kinds of elastic waves.
Ans. The waves produced in a material medium are called elastic waves. Longitudinal waves and transverse waves are two such waves.
Q.4. What do you understand by the term echo?
Ans. The sound heard after reflection from a rigid obstacle is called an echo.
Q.5. State two practical uses or applications of echoes.
Ans. Echoes are used by army to locate gun positions of the enemy and by geologists for locating minerals.
Q.6. What is reverberation?
Ans. Reverberation is the “repeated reflection of sound waves” that results in persistence of sound for sometimes.
Q.7. If 20 waves are produced per second, what is the frequency in hertz?
Ans. 20 Hz.
Q.8. What is SONAR?
Ans. SONAR (Sound Navigation And Ranging) is a technique for determining water depth and locating underwater objects, such as reefs, submarines, and schools of fish.
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