Hello, my name is Mrs. Mehrin and I'm so excited to be learning with you today.

Today we are going to be learning all about noise pollution and acceptable decibel levels.

Hello, welcome to today's lesson from the unit Introduction to Sound.

Your lesson outcome today is: I can compare acceptable decibel levels and classify sounds as noise pollution.

Now I know that sometimes learning can be a little bit challenging, but that's okay because it just means that we are going to be learning together and we are going to be learning lots of fabulous new things.

We are going to be touching upon some of your previous learning all about how to measure sound.

Let's begin.

So here are your five keywords for today's lesson.

Now, you don't need to write these down because I am going to be referring to these throughout today's video.

However, if you feel that it does help you to have them written down, you can pause the video here and do that now.

Fabulous, well done.

And here are all of the definitions for those keywords.

Again, I'm going to refer to these throughout today's video, so you don't need to write them down.

However, if you feel that it does help you, you can pause the video here and jot them down now.

Fabulous, well done.

So our lesson today is split into two parts.

Let's begin with the first one, noise pollution.

So Jun and Andeep are talking about sound and noise, and Jun says, "My baby sister makes sounds like gurgling and crying." And Andeep says, "My baby sister makes noises like gurgling and crying." Is sound and noise the same thing? I'll give you five seconds to think about your answer.

Off you go.

Fabulous, well done.

So sound is created when an object vibrates and sends vibrations in sound waves to our ears.

And noise is a type of sound.

Do you know what type of sound noise is? I'll give you five seconds to think about your answer.

Off you go.

Fantastic, well done.

So noise is an unpleasant or an unwanted sound, so we can classify loud sounds as noise.

So what noise is being made in these examples here? I'll give you five seconds to think about your answer.

Fabulous.

So this is a baby crying, and this can be a loud, unpleasant noise.

What about this one here? Again, I'll give you five seconds to think about your answer.

Fantastic, well done.

So this is children playing, and this can be unwanted noise.

So if we look at the picture, it looks like maybe the mom was working here and the children are making a lot of unwanted noise.

And then finally the last picture, I'll give you five seconds to think about your answer.

Fantastic, well done.

So this is a clock ticking, and this can be a quiet but an unwanted noise.

So especially if you are perhaps trying to fall asleep or you are studying and all you can hear in the background is this tick-tock and that can be quite an unwanted and a little bit annoying in terms of the noise.

Now which of these sounds do you think could be classified as an unpleasant noise? A cat purring, a drum kit, a baby sleeping.

I'll give you five seconds to think about your answer.

Off you go.

Fantastic, well done.

So it would be the drum kit.

Now in some situations, noise can become extremely unpleasant or even unbearable.

And Jun says, "When sound becomes a problem, it's called noise pollution.

But isn't pollution things like litter and car fumes that can damage the environment?" I'll give you five seconds to think about your answer before I share.

Off you go.

Fantastic, well done.

So Andeep says, "Pollution is anything that might cause damage to the earth, and this includes noise too." Now, noise pollution includes when levels of noise in an environment are unwanted.

So Aisha says, "Our neighbor's dog plays in the garden and barks loudly all day.

My mom says this is noise pollution." Now, noise pollution also includes when levels of noise in an environment are harmful.

So for example, Izzy says, "My older sister plays really loud music through headphones every day.

My dad says this is noise pollution that will damage her eardrums." And noise pollution can be annoying, disruptive, and stressful, and it can happen during the day or at night.

So some unwanted sound may be continuous, like busy traffic, or might not happen often, like a train passing.

So if you are sat in busy traffic, you might be able to hear the roar of the engines or you might be able to hear beeping.

And sometimes if you live near a railway line, every so often you might hear a train passing, but it can be quite disruptive.

Now, which of the following words describe the levels of noise considered to be noise pollution? Is it unwanted, pleasant, harmful, or harmless? So I'll give you five seconds to think about your answer.

Off you go.

Fabulous, well done.

So it's unwanted and harmful.

Now we are onto the first task for today's lesson, and it says, which example of noise pollution is Izzy talking about? "We went on holiday and stayed on a farm.

Every morning, the rooster would make crowing noises at 5:00 AM." Now would this sound be unwanted, unpleasant, or harmful? I'll give you some time now.

So I want you to pause the video and I want you to think about what kind of noise pollution Izzy is talking about.

Off you go.

Fantastic, well done.

So a rooster crowing at 5:00 AM every morning would be classified as noise pollution because it would be loud, possibly unpleasant, and definitely unwanted at that time in the morning because absolutely nobody wants to be woken up to a rooster crowing at 5:00 AM in the morning.

Now let's have a look at Jun.

So Jun says, "We went out for a meal at a restaurant.

While we were eating, the smoke detector set off a loud fire alarm." Now would this sound be unwanted, unpleasant, or harmful? Again, I want you to pause the video here and think really carefully about this.

Off you go.

Fantastic, well done.

So a fire alarm making noise in a restaurant would be classified as noise pollution because it would be very loud, unpleasant and could be harmful, especially if you're very close to that fire alarm.

It would be unwanted whilst you're eating your meal.

However, it would be wanted to warn you of any danger of fire.

So although it is unpleasant and although it is very loud, it can actually help you if there is a fire.

So that takes us on now to the second part of our learning, which is acceptable decibel levels.

Now Jun is thinking about noise pollution and he says, "My brother's band plays really loudly when they're rehearsing in our garage.

Our neighbour has complained about noise pollution." Andeep says, "I wonder what level of sound is classified as noise pollution, and how could we find out?" What do you think? Do you have any ideas? I'll give you five seconds to think about your answer.

Off you go.

Fantastic, well done.

So the children know that the volume of sound is measured in decibels, or dB for short, and they decide to carry out some research.

And Jun says, "I used the internet to research noise pollution.

I found that noise above 65 decibels is classified as noise pollution." And Andeep says, "I read a leaflet in the library that said sound becomes harmful when it's above 75 decibels and painful when it is above 120 decibels." Now, what equipment do you think they might need in order to measure the volume of sound in decibels? I'll give you five seconds to think about your answer.

Off you go.

Fantastic, well done.

So before I tell you the answer, let's do a quick check-in of your learning.

So the volume of sound is measured in lux.

Is that true or false? I'll give you five seconds to think about your answer.

Fantastic, well done.

The answer is false.

Now is that because the volume of sound is measured in decimals, or the volume of sound is measured in decibels? I'll give you five seconds to think about your answer.

Off you go.

So the answer is: the volume of sound is measured in decibels.

Now Jun and Andeep can use a data logger with a sound sensor to measure the volume of sounds.

And here we have a data logger with a sound sensor just there and you can see the sound sensor is highlighted in blue.

Now Jun says, "We will measure the noise made by my brother's band next time they rehearse.

If it's recorded as 65 decibels or over, it can be classified as noise pollution." Now what volume do you think normal breathing and conversation would be in decibels? I'll give you five seconds to think about your answer.

Off you go.

Fantastic.

So the average sound level for normal breathing is 10 decibels.

So that's really quiet.

And the average sound level for normal conversation is 60 decibels.

Now, which of the following activities would be approximately 60 decibels? Would it be whispering, a normal conversation, or shouting? Which one of those following activities do you think would be approximately 60 decibels? I'll give you five seconds to think about your answer.

The answer is B, normal conversation.

Now, Jun and Andeep measured the volume of sound when the band rehearsed and Jun says, "I measured a reading of 100 decibels on my sound sensor of my data logger." And Andeep says, "Wow, that would definitely be classified as noise pollution.

I wonder how this noise compares with other sounds." Now, a decibel scale gives examples of common sounds and their approximate decibel reading.

It can be used to find out if sounds should be classified as noise pollution.

So I want you to look closely at the decibel readings of everyday objects on the decibel scale on the next slide.

So breathing we said was 10 decibels.

Rustling leaves comes out at 20 decibels.

A whisper is 30 decibels.

Moderate rainfall, so that's not too heavy but not too light, 50 decibels.

A normal conversation would be 60 decibels.

A truck would be 80 decibels.

Hairdryer would be 90 decibels.

A police siren would be 120 decibels.

And fireworks would be 130 decibels.

Now Jun and Andeep measure the volume of common sounds to make their own decibel scale.

Jun says, "I wonder if our washing machine on full spin is classified as noise pollution." And Andeep says, "My nan's television is really loud.

I wonder if that is classified as noise pollution." So they will use their scale to classify sounds as noise pollution.

Now let's do a quick check-in of your learning.

A decibel scale only gives examples of noise.

Is that true or false? So think about what the definition of noise is.

I'll give you five seconds to think about your answer.

Well done.

It's false.

Now let's see if you can justify your answer.

Is that because a decibel scale gives examples of common sounds in decibels, or a decibel scale is used to measure sounds in decibels? I'll give you five seconds to think about your answer.

Fabulous, well done.

It's A, a decibel scale gives examples of common sounds in decibels.

Now here is task B.

I want you to use the sound sensor to measure the volume of all or some of these sounds at school.

So quiet reading, talking to a partner, walking to assembly, a busy playground, in the lunch hall, when the bell rings, during the register, at home time.

And I want you to use your results to create a decibel scale so that you can monitor noise pollution at school.

So I'd like you to pause the video here and have a go at doing this activity.

Fabulous, well done.

Now I want you to measure the volume of all or some of these sounds at home.

So a ticking clock, a quiet house, family mealtime, bedtime story, music playing, loud television, washing machine, running upstairs.

And I want you to create a decibel scale so that you can monitor noise pollution at home.

So again, I want you to pause the video here and I want you to have a go at this activity.

And then when you are ready, you can return to the video.

Off you go.

Fabulous, well done.

So when you were at school, you may have recorded some of the sounds at being these decibels.

So silent reading would be 38 decibels because although breathing is 10 decibels, when you have lots of children altogether in a classroom and they're all breathing and pages are turning and rustling, you might get a reading of around 38 decibels.

Register, 55 decibels.

Talking, 60 decibels.

Assembly, 63 decibels.

Home time, 64 decibels.

The lunch hall when everyone's in there and they're all having their own conversations might be 76 decibels.

The playground at 105 decibels and the school bell at 120 decibels.

Now, the noise in the lunch hall and playground and from the school bell is over 65 decibels and classified as noise pollution.

Children must not stand next to the school bell when it rings as the noise could cause pain or damage to their ears.

So at home you may have recorded these.

So a ticking clock at 31 decibels, a quiet house at 38 decibels, running up the stairs 55 decibels, a bedtime story at 60 decibels, a loud TV at 70 decibels, family meal 73 decibels, music 75 decibels, and the washing machine at 80 decibels.

So the noise from the loud TV and music, the family meal, and the washing machine is over 65 decibels and classified as noise pollution.

The volume of the TV and music could be decreased.

The family meal may be unwanted noise to a neighbour.

You could go into another room when the washing machine is being used.

So let's do a summary of your learning today.

Noise is unwanted or an unpleasant sound.

Noise pollution describes levels of noise in an environment that are unwanted or harmful.

The volume of sound is measured in decibels.

Normal conversation is approximately 60 decibels.

And a decibel scale can be used to find out if sounds should be classified as noise pollution.

I'm really proud of you today.

You've worked really hard and used your critical thinking.

Well done.