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Cambridge Secondary (7-9). Stage 9. Science. Learner's Book - Unit 6: Sound and space - Question 33

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

Question 33

Which of these will always result in a louder 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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