PENERAPAN GELOMBANG BUNYI PADA SONAR

Summary

In this video, the speaker explains the application of sound waves in measuring distances, specifically using sonar technology. Sonar, which employs ultrasonic waves, helps measure the depth of the ocean or the distance between objects. The process involves sending sound pulses from an instrument called a fathometer, which are reflected back from the ocean floor, allowing the calculation of depth based on the time taken for the pulses to return. A sample problem is provided to illustrate how the speed of sound and the time taken for the signal to return can be used to determine ocean depth. The video concludes with a practice problem for viewers to test their understanding.

Takeaways

• 😀 Sonar (Sound Navigation and Ranging) uses sound waves to detect objects and measure distances underwater.
• 😀 Sonar technology works by emitting a sound wave, which then reflects off objects like the ocean floor and returns to the source.
• 😀 The speed of sound in water is an essential factor in calculating the distance between the sonar system and the target object.
• 😀 The time it takes for the sound wave to return is measured and used to calculate the distance or depth.
• 😀 Sonar uses ultrasonic waves, which have frequencies higher than the human hearing range, for better accuracy in underwater measurements.
• 😀 To calculate the depth of the ocean or distance to an object, the formula used is Depth = (speed of sound × time) / 2.
• 😀 The time between the emission and reception of the sound pulse can vary depending on the depth of the water.
• 😀 A faster return time means the water is shallower, while a longer return time indicates greater depth.
• 😀 An example problem showed how to calculate the ocean's depth as 612 meters, based on a return time of 0.8 seconds and sound speed of 1530 meters per second.
• 😀 Understanding sonar principles can be applied to various real-world applications such as mapping the ocean floor, detecting underwater objects, and navigation for ships.
• 😀 By practicing similar problems, students can improve their understanding of how sound waves help measure distances in underwater environments.

Q & A

What is sonar, and how is it used to measure distance?

Sonar stands for Sound Navigation and Ranging. It is used to detect objects and measure distances by sending out sound waves and analyzing their reflections. In the context of underwater applications, sonar can be used to measure the distance to the seafloor or other objects by calculating the time it takes for sound waves to travel to and return from a target.

How does the reflection of sound waves help in determining distance?

When a sound wave is emitted and hits an object or surface, it reflects back to the source. By measuring the time taken for the sound to travel to the object and back, and knowing the speed of sound in the medium, the distance can be calculated.

What is the role of the speed of sound in water when using sonar?

The speed of sound in water is essential for determining the distance between the sound source and the object. The time it takes for the sound waves to travel to the object and return is used in conjunction with the speed of sound in water to calculate the depth or distance.

What is a fathometer, and how does it relate to sonar?

A fathometer is an instrument used to measure the depth of water. It works by emitting ultrasonic sound pulses and measuring the time it takes for the sound to reflect off the seafloor and return. This data is then used to determine the depth of the water.

How do you calculate the depth of water using sonar?

To calculate the depth of water, the formula S = v * t / 2 is used, where 'S' is the depth, 'v' is the speed of sound in water, and 't' is the time taken for the sound pulse to travel to the seafloor and back. The result is divided by 2 because the sound travels both to the seafloor and back.

Why is the travel time of sound important in determining the depth of water?

The travel time of the sound pulse is important because it helps determine how far the sound has traveled. The time is multiplied by the speed of sound to get the total distance, which is then halved to find the depth since the sound travels both to the seafloor and back.

In the example given, what information is provided to solve the problem?

The example provides the time taken for the sound pulse to return (0.8 seconds) and the speed of sound in water (1530 meters per second). These values are used in the formula to calculate the depth of the ocean.

What was the calculated depth of the ocean in the example problem?

In the example, the depth of the ocean was calculated to be 612 meters. This was determined using the formula and the provided values for time and speed of sound.

What is the significance of the speed of sound in water being 1530 meters per second in the example?

The speed of sound in water being 1530 meters per second is a constant used in the formula for calculating the depth. This speed is important because it helps determine how far the sound wave has traveled in a given time.

How would the depth change if the time for the sound pulse to return was shorter?

If the time for the sound pulse to return were shorter, the calculated depth would be shallower. This is because the sound wave would take less time to reach the seafloor and return, indicating that the seafloor is closer to the sonar.