What term describes emitting sound and using echoes to locate objects or navigate?

What term describes emitting sound and using echoes to locate objects or navigate?

• A. The log and line
• B. Latitude and longitude
• C. Cryptochromes
• D. Echolocation

Answer: (D)

The term describes emitting sound and using echoes to locate objects or navigate is echolocation. It works like a built-in sonar: an animal such as a bat or a dolphin sends out sound waves, the waves travel through air or water, hit objects, and bounce back as echoes. By listening to those echoes, the animal’s brain learns how far away something is, and, from aspects of the echo like its timing, strength, and frequency content, it can infer the size, shape, texture, and even movement of the object. The key idea is that distance is determined from the round-trip time between sending the sound and receiving its echo, with distance roughly equal to the speed of sound times half the travel time. Higher frequencies give more detail but don’t travel as far, which is why many echolocating animals use ultrasonic sounds beyond human hearing. Humans also use a similar concept in sonar systems on ships and submarines, which emit pulses and listen for echoes to map underwater objects. Other terms don’t fit: log and line aren’t related to sound navigation, latitude and longitude are geographic coordinates, and cryptochromes are light-sensitive proteins involved in circadian rhythms, not any form of sound-based sensing.

The term describes emitting sound and using echoes to locate objects or navigate is echolocation. It works like a built-in sonar: an animal such as a bat or a dolphin sends out sound waves, the waves travel through air or water, hit objects, and bounce back as echoes. By listening to those echoes, the animal’s brain learns how far away something is, and, from aspects of the echo like its timing, strength, and frequency content, it can infer the size, shape, texture, and even movement of the object.

The key idea is that distance is determined from the round-trip time between sending the sound and receiving its echo, with distance roughly equal to the speed of sound times half the travel time. Higher frequencies give more detail but don’t travel as far, which is why many echolocating animals use ultrasonic sounds beyond human hearing. Humans also use a similar concept in sonar systems on ships and submarines, which emit pulses and listen for echoes to map underwater objects.

Other terms don’t fit: log and line aren’t related to sound navigation, latitude and longitude are geographic coordinates, and cryptochromes are light-sensitive proteins involved in circadian rhythms, not any form of sound-based sensing.