P13 - Electromagnetic Waves (PAPER 2) Flashcards
what is 1 nanometre in terms of mm and what is the unit
1 nm = 0.000 001mm
What is 1 picometre in terms of nm and what is the unit
1 pm = 0.001nm
What are the 6 types of rays on the electromagnetic spectrum in order of increasing frequency
- radio waves
- microwaves
- infrared radiation
- visible light
- UV waves
- X rays and gamma rays
What is the wavelength of visible light
between 400nm to 700nm
how is energy transferred via electromagnetic waves
electromagnetic waves transfer energy from a source to an absorber
what is the formula used to calculate wave speed
wave speed (m/s) = frequency (Hz) x wavelength (m)
What is white light
light that contains all colours of visible spectrum
What type of radiation is mobile phone radiation
microwave radiation - radio waves at near microwave frequencies
why are microwaves and radio waves hazardous
they can cause the internal parts of bodies to heat up
Why is infrared radiation dangerous
it can cause skin burns
what does having radio waves of different frequencies change (3)
- how far they can travel
- how much they can spread
- how much information they are able to carry
what waves are used for satellite TV
Microwaves
What is the difference between difference between UV and visible light
UV light has a shorter wavelength, UV light can harm the skin and eyes
What are X-rays and gamma rays used for
X-ray - making X-ray images
Gamma ray - sterilisation, killing cancer cells, kill bacteria
What is ionising radiation
radiation that makes uncharged atoms charged
