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| 1. |
Suppose that the speed of sound in air at a given temperature is 400 m / sec . An engine blows a whistle at 1200 H z frequency. It is approaching an observer at the speed of 100 m / sec . What is the apparent frequency as heard by the observerA. 600 HzB. 1200 HzC. 1500 HzD. 1600 Hz |
| Answer» Correct Answer - D | |