Chapter 5: Problem 15

The principle of reflection of sound is used (1) in hearing echos (2) to locate shoals of fish under the sea bed (3) in the detection of insects by bats (4) All the above

Short Answer

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(1) In hearing echos, (2) To locate shoals of fish under the sea bed, (3) In the detection of insects by bats, (4) All the above. Answer: (4) All the above.

Step by step solution

Principle of Reflection of Sound

The principle of reflection of sound states that when a sound wave encounters a surface or an obstacle, it bounces back. This behavior is similar to the reflection of light waves. The angle at which the sound wave strikes the surface is equal to the angle at which it bounces off or reflects (called the angle of incidence and angle of reflection). Now let's analyze each statement to understand which option(s) is/are correct.

(1) In hearing echos

When we shout or make a loud noise, the sound waves travel through the air and may encounter a distant surface (such as a wall or cliff). The sound waves reflect off that surface, and travel back to us. When we hear the reflected sound, we perceive it as an echo. Therefore, the principle of reflection of sound is indeed used in hearing echos.

(2) To locate shoals of fish under the sea bed

The principle of reflection of sound is applied in sonar technology, which is used to locate objects underwater, including shoals of fish. In this technology, sound waves are transmitted into the water. When they encounter an object, such as a shoal of fish, the sound waves reflect back to the source. By calculating the time it takes for the sound waves to travel and reflecting back, it is possible to determine the depth and position of the object. Thus, the principle of reflection of sound is used in this application as well.

(3) In the detection of insects by bats

Bats use a technique called echolocation to detect and locate objects, such as insects, in their surroundings. They emit high-frequency sound waves, which travel through the air and reflect off objects in their path. By listening to the reflected sound, bats can determine the distance, size, and shape of the objects around them. This allows them to navigate and find food effectively. So, the principle of reflection of sound is used in the detection of insects by bats as well.

Final Answer

Based on the above analysis, we can conclude that all the given scenarios (1, 2, and 3) make use of the principle of reflection of sound. Therefore, the correct answer is (4) All the above.

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The principle of reflection of sound is used (1) in hearing echos (2) to locate shoals of fish under the sea bed (3) in the detection of insects by bats (4) All the above

Short Answer

Step by step solution

Principle of Reflection of Sound

(1) In hearing echos

(2) To locate shoals of fish under the sea bed

(3) In the detection of insects by bats

Final Answer

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