Physics paper 2 content :)
- Created by: Lmt_reeses
- Created on: 13-06-18 12:18
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- If two act on an object along the same line, the resultant force is
- Their difference, if the forces act in opposite directions
- Their sum, if the forces act in the same direction
- Magnetism and Electromagnet-ism
- 12.1 = The electromagne-tic spectrum
- Electromagne-tic waves
- Electric waves and magnetic disturbances that can be used ti transfer energy from a source to an absorber.
- Electromagne-tic waves
- 12.2 = Light, infrared, microwaves, and radio waves
- 12.3 = Communicati-ons
- Radio waves of different frequencies are used for different purposes because the wavelength of the waves affect:
- How far they can travel
- How much they spread
- How much information they can carry
- Microwave's are used for satellite TV signals
- Optical fibres are very thin transparent fibres that are used to transmit communication signals by light and infrared radiation
- Radio waves of different frequencies are used for different purposes because the wavelength of the waves affect:
- 12.4 = Ultraviolet waves, X-rays, and gamma rays
- Ultraviolet waves have shorter wavelength than visible light
- Gamma rays are used to kill harmful bacteria in food, to sterilise surgical equipment, and to kill cancer cells.
- Ionising radiation makes uncharged atoms become charged
- X-rays and gamma rays damage living tissues when they pass through it
- 13.1 = Magnetic fields
- Like poles repel, and unlike poles attract
- The magnetic field lines of a bar magnet curve around from the north pole of the bar magnet to the south
- Induced magnetism is created in an unmagnetised magnetic material when the material is placed in the magnetic field
- Steel is used instead of iron to make permanent magnets because steel does not lose its magnetism easily, but iron does
- 13.2 Magnetic fields of electric currents
- An electromagnetic a solenoid that has an iron core. It consists of an insulated wire wrapped around an iron bar
- The magnetic field lines in a solenoid are parallel to its axis and are all in the same direction. A uniform magnetic field is one in which the magnetic field lines are parallel
- Increasing the current makes the magnetic field stronger. Reversing the direction of the current reverses the magnetic field lines
- The magnetic field lines around a wire are circles centred on the wire in a plane perpendicular to the wire
- 12.1 = The electromagne-tic spectrum
- The electromagnet-ic spectrum (in order of decreasing wavelength, increasing frequency and energy) is made of:
- Radio waves
- Microwaves
- Ultraviolet waves
- X-rays and gamma rays
- Visible light
- 12.1 = The electromagne-tic spectrum
- Electromagne-tic waves
- Electric waves and magnetic disturbances that can be used ti transfer energy from a source to an absorber.
- Electromagne-tic waves
- Microwaves
- Used to carry satellite TV programmes and mobile phone calls
- 12.2 = Light, infrared, microwaves, and radio waves
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