What type of electromagnetic waves carry the most energy?
Gamma rays
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What is white light?
From lamps/ sun and it contains all the colours of the visible spectrum.
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What is a bluetooth signal?
It communicates with people within a range of 10m with no cables needed.
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How do we create a radio wave and how do we change the frequency?
They're emitted from an aerial and you can change the frequency of the alternating voltage.
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Why are using mobile phone's a hazard and why did the Uk recommend they should be limited by children?
The radiation emitted may affect your brain and children have thinner skulls than adults so it will effect their brain more.
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What's the Doppler effect and when was it discovered?
Change in the observed wavelength and 1842
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What's the difference between red-shift and blue-shift?
When an object moves away from us the light shits to the red end on the spectrum but when the object gets closer the light shits to the blue end of the spectrum.
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Name 2 discoveries Edwin Hubble made..
1. Light from distance galaxies was red-shifted 2. the further away the galaxy, the bigger it's red-shift.
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What does Edwin Hubble's discoveries tell us about the universe?
The whole universe is expanding.
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Which 2 ideas does the Big Bang Theory state?
1. The universe is expanding after exploding from a small initial point 2. space, time and matter were created.
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What type of radiation, evidence from the big bang theory, was discovered in 1965?
Cosmic microwave background radiation.
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What form of energy do scientists think is responsible for the expansion of the universe accelerating?
Dark energy.
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Other cards in this set
Card 2
Front
Name the electromagnetic spectrum, starting from the largest wavelength...
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