공통영어1 미래엔 김성연 3과 빈칸문제

Which is the ____ environment for studying: a noisy place or a quiet place?

Rarely do people want to put up with a lot of ____ because it can be unpleasant and distracting.

Fortunately, scientists have invented noise-cancelling technology, which is now being used ____ various fields to reduce unwanted noise.

What is the scientific ____ behind this achievement?

To ____ this, let’s examine how sound travels.

Sound is produced through vibrations that occur from a sound source, when the strings of ____ guitar are played, for instance.

The vibrations of the sound source cause the ____ to vibrate and the sound to travel as waves, similar to the ripples created in a lake when you throw a stone.

____ these sound waves reach our ears, the brain interprets them as sound.

Just ____ different ripples in water might overlap if you throw two stones, sound waves can also interfere with each other when they meet.

There are ____ types of interference: constructive and destructive.

Constructive interference occurs when the peaks of ____ waves overlap, resulting in a bigger wave and a louder sound.

Destructive interference, on the other hand, occurs when a peak of one wave overlaps with a valley of another wave, so they cancel each other out and produce a quieter sound, or no ____ at all.

Destructive interference is used in the noise-cancelling ____ of headphones when we listen to music.

Inside the headphones ____ microphones and noise-cancelling circuitry.

The microphones pick ____ sounds from the outside, and the circuitry analyzes them to produce opposite sound waves.

For example, if outside noise has a value of ____ the circuitry will generate an opposite noise of –1 and transmit it to the speakers.

This cancels out the unwanted sound even in noisy surroundings, so you can hear the music sound clearly without ____ up the volume.

However, it is not easy to entirely eliminate external ____ with this technology.

To achieve full noise cancellation, the circuitry must convert the noise into digital data ____ instantly transmit the opposite sound to the speakers as soon as the noise reaches the microphones.

Therefore, this noise-cancellation technology is ____ for predictable sounds like those of car engines and subways that occur regularly or over a period of time.

However, it’s relatively less effective for inconsistent sounds such ____ those of people talking close to you.

Noise-cancelling ____ is not only used in music devices.

Other fields also take ____ of this technology, such as ticket offices at tourist attractions which are often very noisy.

Microphones are installed in ticket offices to detect external noise, and an opposite sound wave is generated ____ transmitted through a speaker, enabling the ticket agent to hear the customer’s voice clearly.

Another area in which this technology is used is drive-through fast-food restaurants ____ coffee shops.

They use noise-cancelling headsets to improve communication between employees ____ customers by eliminating vehicle noise.

These noise-cancelling headsets help drive-through employees take orders ____

The same technology is also used ____ cars, whose audio systems generate waves to cancel out unpleasant sounds such as engine, wind, and road noise.

Thanks to noise-cancelling devices, it is possible for ____ to focus on driving without being disturbed by distracting noises.

As technology advances, many people expect it will solve various social issues caused ____ noise pollution.

A common source of these problems is noisy neighbors, as the noise they make ____ lead to conflict among residents.

Noise-cancellation technology can help address these problems by reducing unwanted disturbances, allowing people ____ lead more peaceful and healthier lives.