| A | B |
|---|
| How many colours in the visible spectrum | seven |
| Ultraviolet is used for... | detecting forged bank notes |
| Gamma rays are used for... | detecting cancer |
| Microwaves are used for... | cooking |
| Infra red cameras show... | the temperature of objects |
| X-Rays can... cells | mutate |
| X-Rays have more energy than... | Infra red radiation |
| Ultrasound waves have a frequency above... | 20000Hz |
| Hz stands for | Hertz |
| Hertz (Hz) is the measure of... | frequency |
| What do boats use to detect fish? | sonar |
| Ultrasound is.... of fish | reflected |
| wave speed = | frequency x wavelength |
| wavelength is measured in... | meters (m) |
| wave speed is measured in... | meters per second (m/s) |
| An eye piece lens... | magnifies an image |
| When light enters an eye piece lens it is... | refracted |
| Refracted means the light... | bends |
| Refraction is caused by light... | changing speed |
| Waves transfer... | energy & information |
| Sound travels ....... than light | slower |
| Sound is a ........ wave | longitudinal |
| EM stands for... | Electromagnet wave |
| EM waves are..... | transverse waves |
| Black is a good........ of infra red radiation | absorber |
| What is the name of our galaxy? | Milky Way |
| Average mass stars finally end up as a... | white dwarf |
| MAssive stars finally end up as a... | supernova or a black hole |
