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We use the decibel scale to measure the sound level of a noise.

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We use the decibel scale to measure the sound level of a noise.

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The unit of the decibel scale is the decibel (dB). This tells us how loud a sound is. However, the decibel scale isn't perfect because our ears are more sensitive to some sounds than others.

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Amplitude is directly linked to the loudness of the sound produced.

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Amplitude is directly linked to the loudness of the sound produced.

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If there is more vibration the wave has a larger amplitude. This produces a loud sound. If there is less vibration the wave has a smaller amplitude. This means the sound is quiet.

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✔ Plastic
✔ Aluminium foil
✔ Metal Sheets
✔ Cardboard
✔ Bamboo
✔ Seashells
✔ Light wood

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Materials is very important in our society today. A material is the matter from which a thing is or can be made. Material is used everyday it is essential, if we had no materials we couldn't make anything. It can easily amplify sound varying on the frequencies and how it manipulates the sound, light waves of the materials. Incoming sound waves of a selected frequency resonated with the film, causes air to flow as if it was massless and funnel as much as 97% of the sound through the holes.

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Cone (Wide & Narrow)
Triangle
Cylinder
Horn (highest frequency shape)

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Sounds can be made louder or amplified in a number of ways. By providing more energy in making the sound its loudness can be increased. This would be achieved by beating a drum with greater vigour, blowing harder on the recorder or using more bodily energy in shouting louder.

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Just a proposal

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We saw in the last section that the compressions and rarefactions in sound waves move your eardrum back and forth. For the most part, these changes in air pressure are extremely small. They don't apply much force on the eardrum, but the eardrum is so sensitive that this minimal force moves it a good distance.

As we'll see in the next section, the cochlea in the inner ear conducts sound through a fluid, instead of through air. This fluid has a much higher inertia than air -- that is, it is harder to move (think of pushing air versus pushing water). The small force felt at the eardrum is not strong enough to move this fluid. Before the sound passes on to the inner ear, the total pressure (force per unit of area) must be amplified.

This is the job of the ossicles, a group of tiny bones in the middle ear. The ossicles are actually the smallest bones in your body. They include:

Sound waves vibrate the eardrum, which moves the malleus, incus and stapes.

The malleus is connected to the center of the eardrum, on the inner side. When the eardrum vibrates, it moves the malleus from side to side like a lever. The other end of the malleus is connected to the incus, which is attached to the stapes. The other end of the stapes -- its faceplate -- rests against the cochlea, through the oval window.

When air-pressure compression pushes in on the eardrum, the ossicles move so that the faceplate of the stapes pushes in on the cochlear fluid. When air-pressure rarefaction pulls out on the eardrum, the ossicles move so that the faceplate of the stapes pulls in on the fluid. Essentially, the stapes acts as a piston, creating waves in the inner-ear fluid to represent the air-pressure fluctuations of the sound wave.

The ossicles amplify the force from the eardrum in two ways. The main amplification comes from the size difference between the eardrum and the stirrup. The eardrum has a surface area of approximately 55 square millimeters, while the faceplate of the stapes has a surface area of about 3.2 square millimeters. Sound waves apply force to every square inch of the eardrum, and the eardrum transfers all this energy to the stapes. When you concentrate this energy over a smaller surface area, the pressure (force per unit of volume) is much greater. To learn more about this hydraulic multiplication, check out How Hydraulic Machines Work.

The configuration of ossicles provides additional amplification. The malleus is longer than the incus, forming a basic lever between the eardrum and the stapes. The malleus moves a greater distance, and the incus moves with greater force (energy = force x distance).

This amplification system is extremely effective. The pressure applied to the cochlear fluid is about 22 times the pressure felt at the eardrum. This pressure amplification is enough to pass the sound information on to the inner ear, where it is translated into nerve impulses the brain can understand.

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We saw in the last section that the compressions and rarefactions in sound waves move your eardrum back and forth. For the most part, these changes in air pressure are extremely small. They don't apply much force on the eardrum, but the eardrum is so sensitive that this minimal force moves it a good distance.

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Just a recommendation

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Sound amplification - Physics - Metropolia Confluence

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Just a proposition

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Sound is something we are in constant contact with every second of every day, whether we're aware of it or not. Even while you sleep, your ears are still listening - your brain just has the good sense to 'switch off' and ignore any sounds it hears, in favour of rest. Here at Amplify, you know we're all about sound. And in celebration of our favourite medium, here is everything you need to know about the science behind it.

Each of our five senses - smell, touch, taste, sight and sound - are a critical aspect of our ability to interact with our environment and ensure our survival. From humans all the way down to some of the smallest insects, sound allows us to send and receive signals, communicate with our environment and, essentially, keep us alive. Sound creates music, conversation, laughter - all the things we love about life. It can also create the things we hate. From the obnoxious notes of the vuvuzela to the irritatingly persistent buzz of a mosquito. Sound helps us 'see' in the dark by providing our brain with information about our environment, and give us insight into situations or things that are out of our sight. But what exactly is it?

Put simply, is the result of something vibrating. Put less simply, it is the emission of vibrational energy from an object. The high and low pressures from that vibration takes the form of a longitudinal wave which travels outwards from the object. The volume and pitch of the sound are dependent on the cause, as well as the amount of energy behind it. Longer soundwaves result in a deeper pitch. Shorter soundwaves give off a higher pitch, and the bigger the wave, the louder the sound. Consider a drum kit: banging a drum makes the skin vibrate. Causing the air around it to be both pushed and pulled by the movement. This vibration creates a 'wave' that moves out from the drum. It's this wave that is picked up by our ears, creating what we interpret as sound: in this case, a drumbeat.

When it comes to our , there are actually two different elements to sound: the physical process and the psychological process. Something physical occurs that generates the sound energy to begin with. Like someone shouting, a glass breaking or a dog barking. Which is in turn processed through psychological processes that begin once our ears pick up that sound, changing it into something that our brains can make sense of. Ears basically act as a funnel for all the different soundwaves we come across every day. As we move through life, our brains are able to collect a whole library full of various sounds that allow us to better familiarise ourselves with our surroundings.

Sound, just like our other senses, makes us feel things too. This is why listening to can tug at our heartstrings, sometimes even taking our breath away. Sound can create a whole host of feelings in all of us, from sheer bliss and happiness to absolute terror (just think of the theme song!). And when you realise that sound is basically just an awesome assault of vibration and energy on our senses, it's really no wonder that it can get such a reaction out of us.

Ronsley is the founder & chief day dreamer at AMPLIFY. He is an author, speaker & serial entrepreneur.

He has a Masters' degree in Software Engineering and an MBA in Psychology and Leadership. He is known as the creator of We Are Podcast - the first Podcasting Conference in the Southern Hemisphere, and the host of The Bond Appetit Podcast and Should I Start a Podcast. He has an audience of over 3 million in 133 countries.

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The science behind sound | Amplify Agency

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Sound is something we are in constant contact with every second of every day, whether we're aware of it or not. Even while you sleep, your ears are still listening - your brain just has the good sense to 'switch off' and ignore any sounds it hears, in favour of rest.

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Just a thought

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Sound is produced when something vibrates. The vibrating body causes the medium (water, air, etc.) around it to vibrate. Vibrations in air are called traveling longitudinal waves, which we can hear. Sound waves consist of areas of high and low pressure called compressions and rarefactions, respectiv…

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Just a suggestion

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r/answers - Which shape makes sound travel the farthest?

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19 votes and 10 comments so far on Reddit

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Just an idea

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Answer (1 of 4): A horn is a tube whose cross-section increases exponentially. The narrow end is called the throat and the wide end is called the mouth. Originating "signal" is placed at the throat. You have a high pressure with a small amplitude in a small area.

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Iron, lead, metal and aluminium. The more dense an object is or more compressed the particles are then sound we travel faster. You could also produce more sound at an amplified level by producing more energy e.g slamming a drum, shouting louder into a microphone ect. It is highly recommended to construct an object in shape of a circular or cone like shape because it said that sound would have traveled further and more efficiently. If circular shaped, the amplifiers start should begin off small and slowly build up to a large round spacing eventually projecting the sound further and increasing the amplitude. When creating an object that has a main duty of amplifying sound, the main goal is to make the output signal stronger then the input signal. The speed varies on the temperature of the object (distance between particles: Elasticity).Speeds comparisons list: Gas -> Liquid -> Solid. Distance = speed x time= 340m/s x 1.6 = 544m/s.