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x-rays

10 à 10

Gamma rays

<10

Each region of the EM spectrum has different uses in everyday life.

radio waves

These are used for transmitting radio signals, phone signals and television. Also stars and gases in space emit radio waves.

Microwaves

These are used for cooking, in our microwaves. They can also be used for communication.

Infrared

This is used for heating, night vision and in remote controls.

Visible light

This is the light that we see. It is emitted by everything.

Ultraviolet

Is emitted from the sun, it is what tans our skin. It is also used for sterilising, and in forensic science, to see things such as traces of bodily fluids, which are invisible to the naked eye.

X-rays

These are used for medical purposes in hospitals, to look at our
bones.

Gamma rays

These are emitted by radioactive substances, and are also used for killing some cancer cells.

Each regions wavelength also relates to what it is used for. For example, radio waves are used for transmittingradio signals because they have a long wavelength, and can therefore travel further without being disrupted. Also the reason we can see visible light is because of its wavelength.radio waves have a long wavelength and low energy, this makes them safe for us to use in the way we do, however gamma rays have a short wavelength and high energy, this is what makes them very dangerous.

Task 5

There are eight different types of energy. These are;

Potential energy

This is energy due to position. Potential energy can be found in all labs and work places. For example, beakers on a desk have potential energy, books on shelves have it, and people sitting on chairs also have potential energy.

Kinetic energy

This is energy due to motion, and can be found in many work places. Something that is falling has kinetic energy.

Electrical energy

This is the energy associated with moving electrical charge and can also be found in many work places. For example, the energy that comes from a power socket is electrical energy.

Light energy

This is the energy of electromagnetic waves

Solar energy

This is the energy that is emitted from the sun

Chemical energy

This is the energy released by chemical reactions. This form of energy can be found in a chemistry laboratory

Nuclear energy

This energy is associated with particles of atoms.

Thermal energy.

This is sometimes called heat energy and can be found in many work places and labs. For example, a water bath in a lab will emit heat energy when in use, as will a light bulb in an office.Different pieces of equipment will use different amounts of energy. For example, a light bulb consumes 75 watts of power, a desk top computer and 15’’ monitor consumes 150 watts, a water heater consumes 3800 watts and a power station consumes 500 megawatts of power.

Energy inputs, outputs and efficiencies

A coal fired power station burns coal at a rate of 75kg of coal per
second.

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