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Cambridge Secondary (7-9). Stage 9. Science. Learner's Book - Unit 6: Sound and space - Question 34

Cambridge Secondary (7-9) · Unit 6: Sound and space

Question 34

Which of these will always result in no sound being heard? Write one letter.
  1. two sound waves cancel
  2. two sound waves reinforce
  3. two sound waves reflect
  4. two sound waves refract
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