공통영어1 미래엔 김성연 3과 변형문제

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

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

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

What is the scientific principle behind ____ achievement?

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

The Principle ____ Sound Waves and Interference

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

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

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

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

There are two types of interference: constructive ____ destructive.

Constructive ____ occurs when the peaks of two 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 ____ produce a quieter sound, or no sound at all.

The Science Behind ____ Headphones

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

Inside the headphones ____ microphones and noise-cancelling circuitry.

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

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

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

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

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

Therefore, this noise-cancellation technology ____ effective 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 as ____ of people talking close to you.

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

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

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

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

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

These noise-cancelling ____ help drive-through employees take orders accurately.

The same technology is ____ used for 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 drivers to focus on driving without being disturbed ____ distracting noises.

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

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

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