Echo & SONAR | Class 10 Physics Guaranteed Question | Applications of Sound

In this Class 10 Physics video, we explore the practical applications of the Reflection of Sound: Echo and SONAR. These topics are frequently asked in Board Exams, often as 3-mark conceptual questions or numericals.

We explain the working principle of SONAR (Sound Navigation And Ranging) and how it is used to measure the depth of the ocean.

📝 Topics Covered:

Quick revision of Echo.

SONAR: Full form and Definition.

How SONAR works (Transmitter & Detector).

Calculation of Ocean Depth using Ultrasound (2d=v×t).

Why Ultrasound is used instead of ordinary sound?

Important Board Exam Questions on SONAR.

🎓 Exam Importance:

"Explain the working of SONAR" is a very common theory question.

Numericals based on "ship and seabed" are "Guaranteed Questions."

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[00:33] - What is Sound? (Definition & Energy form)

[01:01] - Difference between Sound and Light (Mechanical vs. Electromagnetic waves)

[03:38] - Longitudinal vs. Transverse Waves

[06:54] - Speed of Sound vs. Speed of Light

[07:38] - Reflection of Sound (Introduction to Echo)

[08:12] - Conditions for Hearing an Echo (0.1s time gap)

[10:02] - Minimum Distance Calculation for Echo (17 meters)

[12:34] - Numerical Problem 1: Calculating Time for an Echo

[14:04] - Numerical Problem 2: Complex Echo Scenario (Between two hills)

[18:13] - Numerical Problem 3: Finding Distance using Echo

[20:44] - Applications of Sound: What is SONAR?

[22:10] - Ultrasound & Infrasound (How animals like Bats & Dolphins use it)


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