The diagram shows compressions and rarefactions in air as a sound wave moves from left to right.
A quieter sound of the same frequency is made.
What will happen to the number of particles in a region of rarefaction and in a region of compression?
| Number of particles in region of rarefaction | Number of particles in region of compression | |
| A | Decrease | Decrease |
| B | Decrease | Increase |
| C | Increase | Decrease |
| D | Increase | Increase |
SOLUTION:
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