full transcript

From the Ted Talk by Aaron Slepkov: Why can't you put metal in a microwave?

Unscramble the Blue Letters


Household microwave ovens are fitted with cavity magnetrons. When you activate a microwave oven, a heated element within the magnetron ejects electrons, and a strong magnet forces them to spiral owatruds. As they pass over the magnetron’s mllateic cavities, the enrlctoes induce an oscillating charge, generating a ctuunnioos stream of electromagnetic microwaves. A metal pipe drcties the microwaves into the main food cepmnmtoart, where they bounce off the metal walls and penetrate a few centimeters into the food inside. When the microwaves encounter polar molecules in the food, like water, they make them vibrate at high fnequireces.

Open Cloze


Household microwave ovens are fitted with cavity magnetrons. When you activate a microwave oven, a heated element within the magnetron ejects electrons, and a strong magnet forces them to spiral ________. As they pass over the magnetron’s ________ cavities, the _________ induce an oscillating charge, generating a __________ stream of electromagnetic microwaves. A metal pipe _______ the microwaves into the main food ___________, where they bounce off the metal walls and penetrate a few centimeters into the food inside. When the microwaves encounter polar molecules in the food, like water, they make them vibrate at high ___________.

Solution


  1. metallic
  2. directs
  3. continuous
  4. frequencies
  5. compartment
  6. outwards
  7. electrons

Original Text


Household microwave ovens are fitted with cavity magnetrons. When you activate a microwave oven, a heated element within the magnetron ejects electrons, and a strong magnet forces them to spiral outwards. As they pass over the magnetron’s metallic cavities, the electrons induce an oscillating charge, generating a continuous stream of electromagnetic microwaves. A metal pipe directs the microwaves into the main food compartment, where they bounce off the metal walls and penetrate a few centimeters into the food inside. When the microwaves encounter polar molecules in the food, like water, they make them vibrate at high frequencies.

Frequently Occurring Word Combinations


ngrams of length 2

collocation frequency
microwave oven 2
oscillating electric 2
microwave ovens 2
metal walls 2
microwaves encounter 2
soup heated 2
strip electrons 2


Important Words


  1. activate
  2. bounce
  3. cavities
  4. cavity
  5. centimeters
  6. charge
  7. compartment
  8. continuous
  9. directs
  10. ejects
  11. electromagnetic
  12. electrons
  13. element
  14. encounter
  15. fitted
  16. food
  17. forces
  18. frequencies
  19. generating
  20. heated
  21. high
  22. household
  23. induce
  24. magnet
  25. magnetron
  26. magnetrons
  27. main
  28. metal
  29. metallic
  30. microwave
  31. microwaves
  32. molecules
  33. oscillating
  34. outwards
  35. oven
  36. ovens
  37. pass
  38. penetrate
  39. pipe
  40. polar
  41. spiral
  42. stream
  43. strong
  44. vibrate
  45. walls
  46. water