What is noise? - video Dailymotion

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1 year ago

Noise is sounds that bothers us. That can be sound that is too loud or shrill, or sound that lasts too long. Sound protection can help a lot. We answer a viewer question from Pakisho M. from South Africa.

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00:00What is noise?

00:04Is this noise?

00:07Or this?

00:10And what about this?

00:14Pleasant and expected sounds usually aren't perceived as noise.

00:19Noise is sound that bothers us.

00:22What qualifies as noise can vary.

00:24The same sound one person enjoys might be noise to someone else.

00:29Noise is also related to loudness.

00:32When a sound exceeds a certain volume, it's perceived as too loud.

00:36Sound levels are measured in decibels, or dB.

00:39For example, a ticking clock is around 30 decibels, traffic about 70 decibels, and a

00:44jet engine at takeoff reaches a staggering 140 decibels.

00:50Pitch also plays a role.

00:53High-pitched or shrill sounds are generally perceived as more unpleasant than lower-pitched

00:57sounds.

00:59Duration is another factor.

01:01The longer we're exposed to a sound, the more strain it places on our hearing.

01:08Noise is also sound that we're unable to avoid.

01:12Sound waves travel in all directions, so it's not all that easy to escape.

01:20Sound that's too loud can cause permanent hearing damage faster than you might expect.

01:26And constant exposure to noise also increases the risk of cardiovascular disease.

01:33Noise protection can help minimize the negative effects.

01:37This protection can be either direct or indirect.

01:40Direct noise protection focuses on reducing noise at its source.

01:44For example, researchers are working on sound-dampening road surfaces and noise-reducing tires.

01:53Sound limits can also do a lot to reduce traffic noise.

01:58Indirect noise protection works by interrupting the spread of sound waves.

02:03Sound barriers along busy roads are one example, and tunnels can also indirectly reduce traffic

02:09noise.

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