Radiation

how come we cannot see radiation and how does it work?

i learnt how a hot water system works!

Conduction, Convection and Radiation

Radiation

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Heat that travels through invisible waves is called radiation

Question

Today we had a test and it was easy and here is a small test for you to understand one of the questions...

Question

what is convection?


what is conduction?

Convection

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The spread of heat due to the movement of particles in liquids and gasses is called convection

Different transfers of heat

There are three main types of heat transfers.

Conduction: This occurs when particles in one part of an object are heated, causing them to vibrate. These vibrations are then passed from particle to particle throughout an object. Solids are generally good conductors of heat because the bonds between the particles are small. They are constrained together.

Convection: This is the spread of heat from one place to another due to the movement of particles in liquids and gases. The liquids and gases transfer their heat in convection currents. These currents work when the warm air rises, and the cooler, denser air flows quicky to take its spot.

Radiation: This occurs when heat energy travels through invisible waves and it does not need materials to travel through.

Transference of Heat

There are 3 ways to transfer heat-

Conduction: the passage of energy, particularly heat or electricity, through something.

Conduction is the transference of heat through the vibration of particles in a material

Convection: the circulatory movement in a liquid or gas, resulting from regions of different temperatures and different densities rising and falling in response to gravity.

Convection is the transference of heat through the movement of particles in a material

Radiation: energy emitted from a source in the form of waves or rays

The transference of heat through a space by visible rays or waves that don not need a material to travel through

Conduction

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Conduction is the transfer of energy through matter from particle to particle due to vibration of a particle as it is heated

What is Radiation?

Radiation

Radiation describes the process of which energetic particles or waves travel through a material or space.

Ionizing radiation

Ionizing radiation is radiation with sufficiently high energy that can ionize atoms. Most often, this occurs when an electron is knocked out from an electron shell, which leavs the atom with a net positive charge.

There are five types of ionizing radiation:

1. Alpha
   
2. Beta(+/-)


3. Gamma


4. X-Ray


5. Neutron

Non-Ionizing radiation

Non-ionizing form of radiation on living tissue have only recently been studied. instead of producing charged ions when passing through matter, the electromagnetic radiation has sufficient energy to charge only rotational, vibrational or electronic configurations of molecules and atom.

There are five main Non-Ionizing Radiation forms:

1. Visible light
2. Infrared
3. Microwave
4. Radio Waves
5. Thermal Radiation
   
   

Class Prac

Today we discovered that black cans trap heat more than white cans and I thought that it was quite interesting.

Soaring Summer Costs

How I did my kinetic energy in sound energy experiment

Hey Team,

A lot of people have asked during school me how I did my kinetic energy in sound energy experiment with my laptop and speakers and did different noises and the speakers played it at the same time so I decided to post the instructions (note: this will only work in windows 7 and you will need a microphone if you don't have one already built-in):

First hold the speakers' sound hole up-right facing the top (or just tape it)

Plug in the speakers

Right click the speaker icon in the task bar and click 'Recording devices' and then click the microphone you want and click the 'Properties' button on the bottom of the window and go on the 'Listen' tab and tick the box 'Listen to this device'.

Put a little ball or a light object that is smaller than the hole itself. Start making noise and observe the speaker.

Bye for now.

Light Bulbs Explanation

This is a great video that we were shown in class.

It helped me with a lot of the Energy at Home project.

The video explains the three main types of light bulbs:

Incandescent

Fluorescent

Light Emitting Diodes

Hope this helps!

What is Potassium?

A few days ago we did a prac with potassium. When it was heated in the water it suddenly turned into a pinkish smoke. Potassium is a major mineral that is highly important to the human body. It is an electrolyte, which means it carries electrical currents. It isin most people's diets, so most healthy people have a large amount in their intake. It is also found in foods such as bananas, strawberries and fish.

What is convection?

convection is the movement of molecules within liquids and gases. It cannot take place in solids, since niether bulk current flows nor significant diffision can take place in solids.

Kinetic energy in Sound energy

Hello Everyone,

This is the video of kinetic energy in sound energy. Last night, I had nothing to do so I was just thinking about my science lessons in class this week and my teacher had been talking to us about kinetic energy in sound energy and how it works if a light object is put on top of an up-right speaker. We didn't do the experiment in class so i just decided to do it from the speakers I found in my wardrobe. So I just did the experiment with my laptop, the speakers and a piece of Lego.

So First I tried with my hands just simply tapping the microphone and then i smashed a roll of duck tape against the desk and then I tried my guitar and randomly strummed it.

Questions + Answers = 9.6

Q1. Explain why the particles moved the way they did in this experiment?
A1. The heat supplied to the bottom o the beaker by the bunsen burner causes heat to be transferred to the water and dissolving potassium permanganate above the heating point. The water and potassium permanganate particles gain energy and spread out, which decreases their density, this means that they start to rise upwards. As they get further away from the heat source, however, they start to cool and the particles move closer together. The density increases an dthey sink again. This flow of warm water rising and cool water sinking causes the convection.
Q2. This investigation modelled heat transfer by convection. Outline the benefits of modelling concepts in science?
A2. Models are helpful in providing an insight into an effect which is very difficult to see under normal circumstances.
Q3. Are convection currents modelled accuretly in this investigation? What limitations are there to modelling concepts in science?
A3. A variety of responses are possible.

Questions + answers = 9.5

Q1. What evidence is there to suggest that heat travelled along the rods?
A1. The wax melted only because the moved from one end of the rod to the other.

Q1. Through which rod did heat travel the fastest?
A1. The copper rod.
Q3. Which rod is the poorest conductor of heat? What evidence do you have for this conclusion?
A3. The glass rod is the poorest conducter of heat; the wax on the glass rod was the last to be heated.
Q4. Why was it important to put the blobs of wax the same distance from the bunsen burner?
A4. So that the time until melting is affected by the speed of energy conduction and not the distance from the bunsen burner.

OUR CLASS EXPERIMENT DID NOT WORK VERY AFFECTIVELY!!!!

Questions + answers = 9.4

Q1. which material, air or water, expanded more rapidly?
A1. The level in the tube indicates the temperature of the water; the higher the temperature, the higher the level in the tube.
Q2. Which material would make the more sensitive thermometre?
A1. When the water is heated, the water particles vibrate more quickly and the distance between them increases and the volume gets larger. The water in the tube is contrained in how much it can expad sideways, so the increase in volume leads to an increase in the water level. Conversely, when the water is cooled the water particles vibrate less rapidly and the spaces between the particles become smaller, which leads to a decrease.

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1. Explain how the equipment used in this experiment could be used as a thermometer
2. Use the particle model to explain what happens to the level of the water when the flask is heated and cooled.

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1. Explain why the particles moved the way they did in this experiment.
2. This investigation modelled heat transfer by convection. Outline the benefits of modelling concepts in Science.
3. Are convection currents modelled accurately in this investigation? What limitations are there to modelling concepts in Science?

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What is your solution? How did you solve it?
Edwin wanted to improve his typing so he practised and tested himself regularly. His mean typing speed after nine tests was 38·5 words per minute. What speed would he need in the next test to increase his average to 40 words per minute?

If you rub your head on a balloon you make energy :)

Mean

The mean is the average of a group of numbers altogether.

For eg.

1,4,6,3,7,9,

Add them together, so

= 30

Then divide it by the amout of numbers, in this case it is 6, so:

30/6 = 5

The average number is 5.

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We went to the lab and completed the prac below found in Science World Chapter 12.1. The class has a ball completing this prac despite having to cremate some Tiny Teddy biscuits. Great insight into how we get energy from food. We also burnt some apricot slice and rice crackers. No pics or vid taken - sorry :(

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Line graph

I learnt that line graphs are a very good way to display data about the increase and decreases over a period of time.

Graphing

Today we learnt about Graphs and how to interpret line graphs.

If you wanted to compare the temperature in May from October, you would need to find out the two different temperatures:

May: 22 Degrees C

October: 24 Degrees C

=24-22

=2 Degrees

So therefore October is two degrees warmer than May.

You could interpret it as October warmer than May, or May Colder than October.

What we learnt

In science today we learnt about converting energy and transferring energy. Also, we learnt about Renewable energy.

Transferring Energy= This is transfer one form of energy from one place to another

Conservation= This is when you convert energy from one form to another

There is the same amount of energy in the whole world. You are just converting it into different forms. It is like the game of monopoly, the players are exchanging money (transferring) with others, but the total amount of money will always stay the same.

Renewable energy is basically recycling energy and is most reliable because it can be used over and over again. For example, a wound up toy can be wound up many times because it recycles energy.

Kinetic and Potential Energy

We have started the term in Science talking about Kinetic and Potential Energy. Here is a table which categorises each type of energy as either Kinetic or Potential.

energy (elastic)

What is Energy?

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