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15. Give an example for some particles or waves that are moving faster than light in everyday life 16. What is a laser? 17. What is an oscilloscope? 18. What does it means practically that nothing is faster
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15. Give an example for some particles or waves that are moving faster than light in everyday life 16. What is a laser? 17. What is an oscilloscope? 18. What does it means practically that nothing is faster than light in vacuum? 19. What is vacuum?

User Tommi Kyntola
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15.Radiowave

16.laser is device that generates an intense beam of other electromagnetic radiation by emission of photons from excited atoms.

17.this is a laboratory instrument commonly used to display and analyse the waveformof electronic signals.

19. this is a space entirely devoid of matter.

User Changbin Du
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