Topic 5 Light and the Electromagnetic Spectrum Flashcards
Q – state the 7 waves in the EM spec in order of increasing energy
A – R / M / IR / V / UV / X / G
Q – which 4 EM waves are used for communication?
A – Radio / Microwave / Infrared / Visible
Q – Give 2 uses for UV?
A – checking forged bank notes / disinfecting water and fluorescent lamps
Q – Give 2 uses for Gamma waves.
A – detecting and treating cancer / sterilising medical equipment and food.
Q – What happens to the potential danger caused by EM waves as it’s frequency increases?
A – the potential danger also increases.
Q – what 3 things do all EM spec waves have in common?
A – Transverse waves / can travel in a vacuum / speed of light
Q – as light enters a glass block from air it will refract. What happens to the wavelength and speed of the light?
A – the wavelength and speed of the light will decrease.
Q – which type of waves will speed up as they travel into a more dense medium
A – longitudinal waves – (sound or P-waves)
