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1. |
A source of sound frequency 600Hz is placed inside water. The speed of sound in water is 1500 m/s and in air it is 300 m/s. The frequency of sound is recorded by an observer, who is standing in the air, is |
A. | 200 Hz |
B. | 3000 Hz |
C. | 120 Hz |
D. | 600 Hz |
Answer» E. | |