Question

In SONAR, we use
(1) ultrasonic waves
(2) infrasonic waves
(3) radio waves
(4) audible sound waves

Answer 1

Answer: The correct option is (1) ultrasonic waves

Step-by-step explanation:

SONAR (  sound navigation ranging) uses ultrasonic waves i.e. sounds having frequency greater than 20,000 Hz. The reasons are:-

1. They can penetrate water to long distances (because of their high frequency and very short wavelength) unlike ordinary sound waves or infrasonic waves.

2. Sound of these waves do not get mixed with engine noises or other sounds made by the ship. So, no confusion arises as these waves are not audible by human ear.

Hope it helps!

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Answer 2

Answer:

OPTION (1)

Explanation:

SONAR stands for Sound navigation and Ranging .

The concept of SONAR involves the passage of a wave of sound and upon getting back the reflection , the position of objects which reflect the sound is found out .

SONAR uses the principle of echo or reflection of sound .

In SONAR , ultraviolet rays are used .

The ultraviolet radiations are not scattered or deviated much .

The ultraviolet radiations have a large wavelength .

That is why they are used in SONAR .

The SONAR is used to find the depth of the sea from the ship .

Ultrasonic vibrations are emitted from the ship which on reflection from the ground reaches the ship .

The distance is calculated by recording the time in which the rays reach the ship .

The speed of sound in water is already known and hence the distance calculated is the depth of the sea .