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1 markThe diagram shows a source of sound waves and an observer.
Which row of the table shows a situation which would result in a decrease in the frequency of sound observed?
| Source | Observer |
A | moves to the right at 20 ms−1 | moves to the left at 20 ms−1 |
B | moves to the right at 20 ms−1 | moves to the right at 20 ms−1 |
C | moves to the right at 20 ms−1 | stationary |
D | stationary | moves to the right at 20 ms−1 |
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