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Chapter 6: Problem 13

When trying to hear a faint sound from something far away, we sometimes cup a hand behind an ear. Explain why this can help.

Short Answer

Expert verified
Answer: Cupping a hand behind an ear helps us hear faint sounds from far away by collecting and reflecting more sound waves towards the eardrum. This increases the amplitude of the sound waves, effectively amplifying the sound and making it easier to detect.

Step by step solution

01

Understanding Sound Waves

Sound is a form of energy that is produced by vibrations and travels through a medium, such as air, water, or any solid material. These vibrations create sound waves. When these waves reach our ears, they cause our eardrums to vibrate, and those vibrations are sensed by our auditory system, allowing us to hear sounds.
02

Cupping a Hand Behind an Ear

When we cup a hand behind an ear, we essentially create a surface that can collect and reflect sound waves towards the eardrum. This allows for a greater number of sound waves to reach the eardrum, increasing the chances of us hearing the faint sound from far away.
03

Reflecting Sound Waves

The reflections of sound waves are important because they can amplify the original sound, making it easier for us to hear. When we create a surface by cupping our hand behind the ear, the sound waves bounce off the created surface, adding to the initial sound waves that enter our ears. This reflection results in an increased amplitude of the sound waves reaching the eardrum, making the sound appear louder.
04

Amplification of Sound

An increase in the amplitude of sound waves effectively amplifies the sound that we hear. The concept of amplification means that the energy of the sound waves is increased, leading to a higher intensity and volume of the sound. When cupping our hand behind the ear, this effect can help make faint sounds from far away audible and easier to detect by our auditory system. In summary, cupping a hand behind an ear helps us hear faint sounds from far away by collecting and reflecting more sound waves towards the eardrum. This increases the amplitude of the sound waves, effectively amplifying the sound and making it easier for us to detect.

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